By Ajay Kumar

Verified by Ajay Kumar

A chord of a circle measures 16 cm in length, and the perpendicular distance from the center of the circle to the chord is 6 cm. What is the radius of the circle?

  1. 10 cm

  2. 12 cm

  3. 18 cm

  4. 16 cm

Answer: A

Solution

The perpendicular from the centre of a circle bisects the chord. Half the chord is \(16/2=8\) cm. Using the Pythagorean theorem, \(r^2=8^2+6^2=64+36=100\). Therefore, \(r=10\) cm. Trick: Use the right triangle with sides 6 cm, 8 cm, and the radius as the hypotenuse.

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