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Interactive
CK-12 Foundation

Parallelogram Proofs: Quadrilaterals that are Parallelograms

For Students 6th - 12th
What conditions must be met for a quadrilateral to be a parallelogram? A slider interactive allows individuals to move the vertices of a quadrilateral. They answer questions that prove whether a given quadrilateral is a parallelogram.
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Lesson Plan
Shodor Education Foundation

Surface Area of Rectangular Prism

For Teachers 6th - 8th Standards
With this interactive lesson plan, learners compute the surface area of rectangular prisms. They visit an online investigation applet and record data on the provided handout. Pair this lesson plan with the volume lesson plan by the same...
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Lesson Plan
Curated OER

Interactivate - Lines, Rays, Line Segments, and Planes

For Teachers 6th - 8th
Young scholars explore lines, rays, line segments, and planes. For this math lesson, students discuss the math concepts and direct their instructor in graphing functions. Young scholars collaborate in graphing additional functions.