Question

6).From a circular sheet of radius 4 cm, a circle of radius 3 cm is removed. Find the area of the remaining sheet. (take `pi=22/7`)(7).Saima wants to put a lace on the edge of a circular table cover of diameter 1.5 m. Find thelength of the lace required and also find its cost if one meter of the lace costs ₹15.(take `pi=22/7`)

Answer 1

area of 4 cm sheet `= pi(4)^2 `
`= 16 pi`
area of 3 cm sheet`= pi(3)^2 = 9 pi`
remaining area `= 16 pi - 9 pi`
`= 7 pi = 7 xx 3.14`
`= 21.98 cm^2`
answer