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JAMB Mathematics 2013 Objective — Question 28

Question 28 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2013 Objective paper, with the correct answer and a full explanation.

Find the length of a chord which subtends an angle of 90° at the centre of a circle whose radius is 8cm.

A. A. 8√3 cm
B. B. 4cm
C. C. 8cm
D. D. 8√2 cmCorrect

Explanation

Chord=2r sin(θ/2)=2×8×sin45°=8√2 cm.

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