2017
Mathematics
JAMB
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
Correct Answer: 19cm
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)
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)THIS WEEK's
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