Exams › SSC CGL (Prelims) › General

A circular disc is divided into 6 equal sectors. If the area of one sector is 66 cm², what is the radius of the disc?

1. 10 cm
2. 15.32 cm
3. 11.22 cm
4. 13 cm

Correct answer: 11.22 cm

Solution

If one of 6 equal sectors has area 66 cm², the total area of the disc is \(6\times 66=396\) cm². Using \(\pi r^2=396\), we get \(r=\sqrt{396/\pi}\approx 11.22\) cm. So the radius is 11.22 cm.

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