Match the perimeter formula

Exercise and reference answers

Matching pairs

1. Left

   Square, side a

   Right

   4a units

2. Left

   Equilateral tri

   Right

   3a units

3. Left

   Rectangle a by b

   Right

   2(a + b) units

4. Left

   Circle, diameter d

   Right

   pi times d

5. Left

   Circle, radius r

   Right

   2 pi r

6. Left

   Semicircle arc

   Right

   pi times r

Instructions

Match each shape to its perimeter.

Explanation