This guide contains interactive activities and videos that can used with the Math curriculum from Grades 7-9.

- 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.
- Explore the sum of the interior angles of triangles, quadrilaterals and other polygons using rotations of 180° about a midpoint.
- 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.
- 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).
- 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.
- 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.
- 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.

- Last Updated: Dec 5, 2022 10:46 AM
- URL: https://teachers-ab.libguides.com/math7-9
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Subjects:
Mathematics

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