An umbrella has 8 ribs which are equally spaced (see Fig. 12.13). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella.
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Solution:
⇨ Given
r = 45 cm
⇨ Area of the flat circular umbrella
⇨ Area between the two ribs
Exercise 12.2