10. An umbrella has 8 ribs which are equally spaced (see Fig. ). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella.
It is given that the umbrella has 8 ribs so the angle of each sector is 45o.
Thus the area of the sector is given by:-
Hence the area between two consecutive ribs is .
Create Your Account