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How do the area and circumference of a circle compare to its radius and diameter? This tool allows you to investigate these relationships and then hone your skills by completing some problems.
Investigate congruence by manipulating the sides and angles of a triangle. If you can create two different triangles with the same parts, then those parts do not prove congruence.
Exploring Angle Sums
Explore the sum of the interior angles of triangles, quadrilaterals and other polygons using rotations of 180° about a midpoint.
LearnAlberta: Exploring Angles and Parallel Lines
Explore the angle relationships created by a transversal intersecting with parallel lines. The angle terms adjacent, opposite, complementary, corresponding and alternate are defined and explained.
LearnAlberta: Exploring Surface Area and Volume
Use this learning object to select a geometric solid and adjust its dimensions to see how the changes affect surface area and volume. Compare different solids and see how each can be described in two dimensions (nets).
Proof Without Words: The Pythogorean Theorem
Why is c2 = a2 + b2? Watch a dynamic, geometric "proof without words" of the Pythagorean Theorem. Can you explain the proof? Follow the instructions located below the activity.
Use this interactive to investigate how changes in the scale factor influence the ratio of perimeters and the ratio of areas between two figures.
TED: How to Find Area and Perimeter
Learning to calculate area is one of the most practical and useful math skills you could ever learn. Whether on earth or on another planet, this Flocabulary song covers the length and width of calculating perimeter and area with some real life and out of this world examples.
TED: How many ways are there to prove the Pythagorean Theorem
What do Euclid, 12-year-old Einstein, and American President James Garfield have in common? They all came up with proofs for the famous Pythagorean theorem, one of the most fundamental rules of geometry.
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