Chapter 7

Two-Dimensional Shapes

Learn flat shapes: square, rectangle, triangle and circle.

Flat 2D shapes

2D shapes are flat shapes we can draw on paper. Here are four to know.

  • Square – 4 equal sides.
  • Rectangle – 4 sides, like a door.
  • Triangle – 3 sides and 3 corners.
  • Circle – round, with no corners.

Key idea

To name a flat shape, count its sides and corners.

Counting sides

Worked example

A shape has 3 straight sides and 3 corners. It is a triangle.

Remember

  • Square and rectangle have 4 sides.
  • Triangle has 3 sides.
  • Circle has no corners.

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