JAMB Mathematics 2009 Objective — Question 28

Question 28 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

A chord is drawn 5 cm away from the centre of a circle of radius 13 cm, calculate the length of the chord

A. 7 cm
B. 9 cm
C. 12 cm
D. 24 cmCorrect

Explanation

Using Pythagoras: x^2 = 13^2-5^2 = 169-25 = 144. x = sqrt144 = 12cm. Length of chord = 12cm + 12cm = 24cm.

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