Same area, different lengths

This task is about working out the width and perimeter for different shapes with the same area.

Question 1Change answer

A rectangle has an area of 84 cm2.

Several rectangles can be drawn all with an area of 84 cm2 but with different perimeters.

Complete the table below showing the width and perimeter of three rectangles all with an area of 84 cm2 and the given length.

 

Length (cm)

Width (cm)

Perimeter (cm)


a)

42

i)     

ii)     


b)

14

i)     

ii)     


c)

12

i)     

ii)