The other night I was tutoring one of my high school geometry students. We were working on cross sections and identifying what shapes were made when you “cut” into the shape with a plane at different angles. The images on his homework were making it difficult to easily see what shapes were being made.
I grabbed my youngest son's play dough and we began making 3-D shapes. We made spheres, cubes, triangular prisms, and even managed to make a hexagonal prism!
Here's a look at the sphere we did:
We created a circle when it was cut.