Question

From a rectangular piece of metal sheet of length and breadth 1.60 m and 80 cm respectively, 3 circular sheets of 20 cm radius are cut out .what area of metal is left? use pie =3.14

Answer 1

We know that l = 1. 60 m and b = 80 cm

we should change cm to m and we get 80/100 = 0. 8m
then find the area of rectangle = l *b

= 1. 60 * 0. 8
= 1. 280 m square


then area of 3 circle = 3pie r square
area of a circle = pie r square



3 * 3. 14 * 20 * 20
3 * 3. 14 * 400
= 3768 cm square


we should convert m square to cm square therefore

1. 280 * 100 *100 = 12800


area of rectangle - area of 3 circle


12800 - 3768 = 9032 cm square

i hope this is the right amswer hope it helps