Question

find the area of the shaded regions in the figures below, whose measures of radius or diameters are given. take
`\pi 3.14`

Answer 1

a) The area is comprised of a semicircle and a rectangle so the combined area is given by:

`(\pi(10)^2)/(2)+25*20=657m^2`

So the area is 657 square meters.

b) The area of required region is the difference between the area of large circle and small circle. The radius of large and small circles are 12 cm and 10 cm respectively.

So the area is given by:

`\pi(12)^2-\pi(10)^2=144\pi-100\pi=44\pi=138.16cm^2`

Hence the area is 138.16 square centimeters.