Question 48
Circle TheoremsIn the diagram, MN is a chord of a circle KMN centre O and radius 10 cm. If ∠MON = 140°, find correct to the nearest cm, the length of the chord MN.
- A.19 cm
- B.18cm
- C.17 cm
- D.12 cm
Show the answer and explanation
Answer: A (19 cm)
Explanation
MN = 2 × 10 × sin 70° ≈ 18.8 ≈ 19 cm.