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

Mathematics
JAMB 2017

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

  • A. 10cm
  • B. 19cm
  • C. 17cm
  • D. 12cm
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Correct Answer: Option B
Explanation

Find the diagram
Sin 70°

x = 10 Sin 70°

= 9.3969

Hence, length of chord MN = 2x

= 2 × 9.3969

= 18.79

= 19cm (nearest cm)

There is an explanation video available below.

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