Question

From a circle of radius 7 cm cut a circle of radius 2.8 cm. Find the area of remaining sheet circle .

Answer 1

${huge{MasterJi}}$

so basically what we're doing subtracting the area of the circle of radius 7cm from the circle of radius 2.8 CM

area of radius 7 cm

πr^2=22/7*7*7=154cm^2

area of radius 2.8 cm

πr^2=22/7*2.8*2.8=24.64

now subtracting

154-24.64=129.36