2013
Mathematics
JAMB
Find the length of a chord which subtends an angle of 90° at the centre of a circle whose radius is 8 cm.
A.
8√3 cm
B.
4 cm
C.
8 cm
D.
8√2 cm
Correct Answer: 8√2 cm
Explanation
Length of chord =2rsin(θ/2) = 2 × 8 × sin(90/2) = 16 × √2/2 = 8√2cm
Length of chord =2rsin(θ/2) = 2 × 8 × sin(90/2) = 16 × √2/2 = 8√2cmTHIS WEEK's
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