Question

a square cardboard of side 20m has a 4m wide border round three of its sides. find the area of the border

Answer 1

Answer: 12

Step-by-step explanation:

Answer 2

The area of the border= 240 $m^{2}$

Step-by-step explanation:

The side of a square cardboard is 20m

The width of the border = 4m

Therefore the area of the border is 20$\times$4 $m^{2}$ = 80 $m^{2}$

This is the area of border of 1 side.

According to the question we need to find area of border of 3 sides

Therefore the area of the border of 3 sides is 3 $\times$ 80 $m^{2}$ = 240 $m^{2}$

The area of the border of 3 sides is  240 $m^{2}$