Question

An umbrella has 8 ribs which are equally spaced (see figure). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella.[Use π = 22/7]

Answer 1

There are 8 ribs in an umbrella. The area between two consecutive ribs is subtending  360^o /8 = 45^o  at the centre of the assi,ed flat circle. 

   

Area between two consecutive ribs of circle        =