In the diagram, MN is a chord of a circle KMN centre O and radius 10cm. If < MON = 140o, find, correct to the nearest cm, the length of the chord MN.

A. 19cm

B. 18cm

C. 17cm

D. 12cm

Correct Answer: Option A

**A. 19cm**

Explanation

From the diagram

sin 70° = x/10

x = 10sin 70°

= 9.3969

Hence, length of chord MN = 2x

= 2 x 9.3969

= 18.7938

= 19cm (nearest cm)

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