What can 2R remember about shape?

2D Shapes

3D shape

a cylinder looks like a can

Vocabulary

Where have we used shapes in other domains?

Vertices are corners

3D shapes have faces, not sides

A sphere looks like a ball

We have used shapes in fractions, we found 1/2, 1/4 and 3/4 of different shapes.

An oval is a stretched out circle

A rectangle is a stretched out square

2D shapes are flat

3D shapes are physical shapes - we can hold them

If the sides don't all join together, it's an open shape (it is not a polygon)

The 'D' in 2D and 3D stands for 'dimensional'.

A pentagon has five sides

A circle has 0 vertices

A heart has two vertices

A decagon has twelve sides

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