Name flat shapes by their properties
The idea
Trace the boundary of the shape and count its straight sides and corners.
Step by step
- Trace the boundary of the shape and count its straight sides and corners.
- Use those properties to name the shape; a square is also a special rectangle.
- Turn or resize a paper shape and check that its defining properties remain.
Example
A flat shape has exactly three straight sides and three corners. Which shape is it?
Answer
triangle
A triangle has three sides and three corners.
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Sort paper triangles, circles, squares and other rectangles. Explain a property that fits every shape in each group.
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