Question

An umbrella has 8 ribs which are equally spaced. Assuming the umbrella to be a flat circle of radius 45 cm, find the area in $c{m}^2$ between the two consecutive ribs of the umbrella.

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Answer 1

Radius = 45cm

8 ribs implies angle subtend between consecutive ribs = $\frac{360}{8}$ = ${45}^{\circ }$ .

Area between consecutive ribs = $\frac{45}{360}$ × $\pi$ × ${45}^2$ = 795.22 $c{m}^2$