Rectangles, arches, and triangles are the most common shapes used to build big structures. What happens when you push the side of a rectangle? The rectangle is a wobbly, unstable shape.

You'll test the stability of a triangle and a square by standing them on a table and pressing on them. The one that changes shape less is more stable. 1. With your partner, build a triangle and a ...

PHOTOS XXXXXXXXXX Understanding the dimensions of shapes (e.g., big, thin, flat), shape names (e.g., triangle, rectangle) and shape properties (e.g., three-sided, pointy) are all part of spatial ...

Triangles become pyramids. You're now a square based pyramid with 4 triangular faces and a square face for your bottom. You can get pyramids with different shaped bases. Triangles, pentagons ...