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Grade 3 · Maths · Lessons
Shape families
◇rhombus▭rectangle⬜square⏢quadrilateral
Shape families.
The big ideaEqual sides make a rhombus. Square corners make a rectangle. Both make a square.

How it works

A quadrilateral has four sides.

Equal sides make a rhombus. Square corners make a rectangle. Both make a square.

A square is a rectangle and a rhombus.

Rhombus and rectangle• rhombus: 4 equal sides• rectangle: 4 square cornersSquare• 4 equal sides• 4 square corners
Families.

Example 1: A rhombus

  1. A shape has 4 equal sides but slanted corners.
  2. It has four sides, so it is a quadrilateral.
  3. It is a rhombus.

Example 2: A square

  1. A shape has 4 equal sides and 4 square corners.
  2. It has both properties.
  3. It is a square, and also a rectangle and a rhombus.

Example 3: Not a square

  1. A rhombus with slanted corners.
  2. It has equal sides, but not square corners.
  3. It is not a square.

Words to know

quadrilateral
A shape with four sides.
rhombus
A shape with four equal sides.

Watch out

Try it

  1. How many sides does a quadrilateral have?
  2. Is every square a rectangle?
  3. Is every rectangle a square?
  4. What has 4 equal sides but slanted corners?
Answers: 1. 4 · 2. yes · 3. no · 4. a rhombus
For grown-upsSort card shapes into families together: all with four sides, all with square corners.
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