Question

Sonal wants to make a disc to play secrets a circle of diameter 10 cm from a circular plastic sheet or diameter 14 cm find the area of the disc and also find the area of the remaining plastics

Answer 1

given diameters are : 10 and 14
so the radius are : 5 and 7
area of disc (ring) : Pi R square - Pi r square
22 by 7 into seven square - 22 by 7 into 5 square
22 by 7 into 49 - 22 by 7 into 25
22 into 7 - 22 into 3.571
154 - 78.5