Students work in pairs to construct a simple stereoscope.

Learners visualize, in three dimensions, features represented by contour lines on a topographic map. They see that the different elevations shown on a two dimensional topographic map can be used to build a 3-D model.

Learners of all ages investigate area and perimeter through pentominoes. In this geometry lesson plan, students calculate the are and perimeter of different geometric shapes and describe the properties of similar and congruent shapes....