In the diagram MN is a chord of a circle KMN centre O and radius…

In the diagram MN is a chord of a circle KMN centre O and radius 10cm. If o, find, correct to the nearest cm, the length of the chord MN.

Correct Answer: Option A

Explanation

From the diagram
sin 70^o = (frac{x}{10})
x = 10sin 70^o
= 9.3969
Hence, length of chord MN = 2x
= 2 x 9.3969
= 18.7938
= 19cm (nearest cm)