Q. 104.1( 231 Votes )

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.

Answer :

There are 8 ribs in the given umbrella. The area between two consecutive ribs is subtending = 45at the centre of the assumed flat circle

Now we know that area of a sector of a circle subtending an angle x is given by

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