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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