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Geometry: An Interactive Journey to Mastery

Season 1
Like other math fields, geometry teaches us how to think. It leads students to uncover new truths based on already established ideas and facts. In short, geometry is among the great intellectual feats of humankind. Build an understanding of geometry from the ground up with these 36 lectures.
201436 episodes7+
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Episodes

  1. S1 E1 - Geometry - Ancient Ropes and Modern Phones
    May 1, 2014
    33min
    TV-PG
    Explore the origins of one of the oldest branches of mathematics. See how geometry not only deals with practical concerns such as mapping, navigation, architecture, and engineering, but also offers an intellectual journey in its own right - inviting big, deep questions. #Science & Mathematics
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  2. S1 E2 - Beginnings - Jargon and Undefined Terms
    May 1, 2014
    28min
    TV-PG
    Lay the basic building blocks of geometry by examining what we mean by the terms point, line, angle, plane, straight, and flat. Then learn the postulates or axioms for how those building blocks interact. Finally, work through your first proof - the vertical angle theorem.
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  3. S1 E3 - Angles and Pencil-Turning Mysteries
    May 1, 2014
    28min
    TV-PG
    Using nothing more than an ordinary pencil, see how three angles in a triangle can add up to 180 degrees. Then compare how the experience of turning a pencil on a flat triangle differs from walking in a triangular shape on the surface of a sphere. With this exercise, Professor Tanton introduces you to the difference between flat and spherical geometry.
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  4. S1 E4 - Understanding Polygons
    May 1, 2014
    31min
    TV-PG
    Shapes with straight lines (called polygons) are all around you, from the pattern on your bathroom floor to the structure of everyday objects. But although we may have an intuitive understanding of what these shapes are, how do we define them mathematically? What are their properties? Find out the answers to these questions and more.
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  5. S1 E5 - The Pythagorean Theorem
    May 1, 2014
    29min
    TV-PG
    We commonly define the Pythagorean theorem using the formula a2 + b2 = c2. But Pythagoras himself would have been confused by that. Explore how this famous theorem can be explained using common geometric shapes (no fancy algebra required), and how it's a critical foundation for the rest of geometry.
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  6. S1 E6 - Distance, Midpoints, and Folding Ties
    May 1, 2014
    29min
    TV-PG
    Learn how watching a fly on his ceiling inspired the mathematician René Descartes to link geometry and algebra. Find out how this powerful connection allows us to use algebra to calculate distances, midpoints, and more.
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  7. S1 E7 - The Nature of Parallelism
    May 1, 2014
    35min
    TV-PG
    Examine how our usual definition of parallelism is impossible to check. Use the fundamental assumptions from the previous lectures to follow in Euclid's footsteps and create an alternative way of checking if lines are parallel. See how, using this result, it's possible to compute the circumference of the Earth just by using shadows!
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  8. S1 E8 - Proofs and Proof Writing
    May 1, 2014
    29min
    TV-PG
    The beauty of geometry is that each result logically builds on the others. Mathematicians demonstrate this chain of deduction using proofs. Learn this step-by-step process of logic and see how to construct your own proofs.
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  9. S1 E9 - Similarity and Congruence
    May 1, 2014
    34min
    TV-PG
    Define what it means for polygons to be "similar" or "congruent" by thinking about photocopies. Then use that to prove the third key assumption of geometry - the side-angle-side postulate - which lets you verify when triangles are similar. Thales of Ionia used this principle in 600 B.C.E. to impress the Egyptians by calculating the height of the pyramids.
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  10. S1 E10 - Practical Applications of Similarity
    May 1, 2014
    31min
    TV-PG
    Build on the side-angle-side postulate and derive other ways of testing whether triangles are similar or congruent. Also dive into several practical applications, including a trick botanists use for estimating the heights of trees and a way to measure the width of a river using only a baseball cap.
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  11. S1 E11 - Making Use of Linear Equations
    May 1, 2014
    29min
    TV-PG
    Delve deeper into the connections between algebra and geometry by looking at lines and their equations. Use the three basic assumptions from previous lectures to prove that parallel lines have the same slope and to calculate the shortest distance between a point and a line.
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  12. S1 E12 - Equidistance - A Focus on Distance
    May 1, 2014
    33min
    TV-PG
    You've learned how to find the midpoint between two points. But what if you have three points? Or four points? Explore the concept of equidistance and how it reveals even more about the properties of triangles and other shapes.
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  13. S1 E13 - A Return to Parallelism
    May 1, 2014
    31min
    TV-PG
    Continue your study of parallelism by exploring the properties of transversals (lines that intersect two other lines). Prove how corresponding angles are congruent, and see how this fact ties into a particular type of polygon: trapezoids.
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  14. S1 E14 - Exploring Special Quadrilaterals
    May 1, 2014
    30min
    TV-PG
    Classify all different types of four-sided polygons (called quadrilaterals) and learn the surprising characteristics about the diagonals and interior angles of rectangles, rhombuses, trapezoids, and more. Also see how real-life objects - like ironing boards - exhibit these geometric characteristics.
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  15. S1 E15 - The Classification of Triangles
    May 1, 2014
    30min
    TV-PG
    Continue the work of classification with triangles. Find out what mathematicians mean when they use words like scalene, isosceles, equilateral, acute, right, and obtuse. Then, learn how to use the Pythagorean theorem to determine the type of triangle (even if you don't know the measurements of the angles).
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  16. S1 E16 - Circle-ometry - On Circular Motion
    May 1, 2014
    32min
    TV-PG
    How can you figure out the "height" of the sun in the sky without being able to measure it directly with a ruler? Follow the path of ancient Indian scholars to answer this question using "angle of elevation" and a branch of geometry called trigonometry. You learn the basic trig identities (sine, cosine, and tangent) and how physicists use them to describe circular motion.
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  17. S1 E17 - Trigonometry through Right Triangles
    May 1, 2014
    28min
    TV-PG
    The trig identities you explored in the last lecture go beyond circles. Learn how to define all of them just using triangles (expressed in the famous acronym SOHCAHTOA). Then, uncover how trigonometry is practically applied by architects and engineers to measure the heights of buildings.
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  18. S1 E18 - What Is the Sine of 1°?
    May 1, 2014
    32min
    TV-PG
    So far, you've seen how to calculate the sine, cosine, and tangents of basic angles (0°, 30°, 45°, 60°, and 90°). What about calculating them for other angles - without a calculator? You'll use the Pythagorean theorem to come up with formulas for sums and differences of the trig identities, which then allow you to calculate them for other angles.
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  19. S1 E19 - The Geometry of a Circle
    May 1, 2014
    29min
    TV-PG
    Explore the world of circles! Learn the definition of a circle as well as what mathematicians mean when they say things like radius, chord, diameter, secant, tangent, and arc. See how these interact, and use that knowledge to prove the inscribed angle theorem and Thales' theorem.
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  20. S1 E20 - The Equation of a Circle
    May 1, 2014
    33min
    TV-PG
    In your study of lines, you used the combination of geometry and algebra to determine all kinds of interesting properties and characteristics. Now, you'll do the same for circles, including deriving the algebraic equation for a circle.
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  21. S1 E21 - Understanding Area
    May 1, 2014
    28min
    TV-PG
    What do we mean when we say "area"? Explore how its definition isn't quite so straightforward. Then, work out the formula for the area of a triangle and see how to use that formula to derive the area of any other polygon.
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  22. S1 E22 - Explorations with Pi
    May 1, 2014
    31min
    TV-PG
    We say that pi is 3.14159 ... but what is pi really? Why does it matter? And what does it have to do with the area of a circle? Explore the answer to these questions and more - including how to define pi for shapes other than circles (such as squares).
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  23. S1 E23 - Three-Dimensional Geometry - Solids
    May 1, 2014
    32min
    TV-PG
    So far, you've figured out all kinds of fun properties with two-dimensional shapes. But what if you go up to three dimensions? In this lecture, you classify common 3-D shapes such as cones and cylinders, and learn some surprising definitions. Finally, you study the properties (like volume) of these shapes.
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  24. S1 E24 - Introduction to Scale
    May 1, 2014
    30min
    TV-PG
    If you double the side-lengths of a shape, what happens to its area? If the shape is three-dimensional, what happens to its volume? In this lecture, you explore the concept of scale. You use this idea to re-derive one of our fundamental assumptions of geometry, the Pythagorean theorem, using the areas of any shape drawn on the edges of the right triangle - not just squares.
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  25. S1 E25 - Playing with Geometric Probability
    May 1, 2014
    30min
    TV-PG
    Unite geometry with the world of probability theory. See how connecting these seemingly unrelated fields offers new ways of solving questions of probability - including figuring out the likelihood of having a short wait for the bus at the bus stop.
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Details

More info

Audio languages
English
Subtitles
English [CC]
Producers
The Great Courses
Cast
James Tanton
Studio
The Great Courses
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