wunder betaGeometry Classes for Teens
11 free geometry classes for teens (Ages 13–17) on Wunder — short, fact-checked courses and lessons with narration and a quiz. Filter by age — each link is its own page, not a JavaScript toggle.
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Working with Angles
Name angles, measure them with a protractor, and use powerful angle facts — straight lines, points, and crossing lines — to hunt down missing angles.
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Trigonometry Basics
Unlock the link between angles and sides in right triangles. Learn SOH-CAH-TOA and use sine, cosine, and tangent to work with the sides you can't reach.
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The Pythagorean Theorem
In every right triangle, a² + b² = c². Discover this 2,500-year-old rule, use it to find missing sides, and spot the famous 3-4-5 triangle everywhere.
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Polygon Angles, Area, and Volume
Add up the angles inside any polygon, measure the area of flat shapes, and calculate the volume of solids — three powerful geometry tools in one course.
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Congruence, Parallel Lines, and Constructions
Prove two shapes are identical with congruence rules, unlock the angle facts hidden in parallel lines, and build perfect shapes with a compass and straightedge.
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Circumference and Area of Circles
Meet pi, the number hidden in every circle, and use it to measure the distance around a circle (C = πd) and the space inside it (A = πr²).
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Measuring Heat Energy
Untangle heat from temperature, meet the joule, and find out why a warm bath holds more heat than a spark and why a full kettle needs more energy than a cup.
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Roller Coasters: The Physics of Fun
The real physics behind the thrills: how the first hill stores energy, what g-forces do to your body, why loops are teardrops not circles, how launches work, and why coasters are engineered fear.
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The Art of Debate
Argue with logic, evidence, and confidence, not just volume.
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Music Theory
Crack the code behind melody, harmony, and the circle of fifths.
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Geometry
Angles, triangles, circles, and proof: how shapes reveal hidden truths.
All Geometry courses (topic hub)
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