By Mansi Yadav

Verified by Ajay Kumar

A chord of length 16 cm is 6 cm away from the center of a circle. Find the radius of the circle.

  1. 10 cm

  2. 12 cm

  3. 8 cm

  4. 14 cm

Answer: A

Solution

Solution: The perpendicular from the centre bisects the chord, so half the chord is \(16\div2=8\) cm. Using Pythagoras, \(r^2=8^2+6^2=64+36=100\). Therefore, \(r=10\) cm. Trick: Use the half-chord, the distance from the centre, and the radius as a right triangle.

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