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

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Solution

$\begin{matrix} A r e a o f e a c h r i b s = \frac{a r e a o f c i r c l e}{8} = \frac{π r^{2}}{8} = \frac{3.14 \times 45 \times 45}{8} = 794.8125 c m^{2} \end{matrix}$

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Q. Question 10
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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An umbrella has 8 ribs which are equally spaced. Assuming umbrella to be flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella.

Areaofeachribs=areaofcircle8=πr28=3.14×45×458=794.8125cm2

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

$\begin{matrix} A r e a o f e a c h r i b s = \frac{a r e a o f c i r c l e}{8} = \frac{π r^{2}}{8} = \frac{3.14 \times 45 \times 45}{8} = 794.8125 c m^{2} \end{matrix}$