Area of circle and sector

What is the area of the shaded region ?

Find the area of the shaded region in Fig. If radii of the two concentric circles with centre O are 7 cm and 14 cm respectively and ∠ AOC = 40°.

(nearest tenth digit)

The diagram shows the area of a lawn covered by a water sprinkler.

What is the area of the lawn that is covered by the sprinkler?

find the area of the sectors formed by ∠DFE.

A region with a 3-mile radius has a population density of about 6195 people per square mile. Find the number of people who live in the region.

• 175,195

• 157,159

• 175,159

• None of them