Question 29


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Jambmaths question: 

A chord of a circle of radius 7cm is 5cm from the centre of the circle. What is the length of the chord?

Option A: 


Option B: 


Option C: 


Option D: 


Jamb Maths Solution: 

$\begin{align}  & A{{B}^{2}}={{7}^{2}}-{{5}^{2}}=49-25\text{    }\!\!\{\!\!\text{ Pythagoras theorem }\!\!\}\!\!\text{ } \\ & A{{B}^{2}}=24 \\ & AB=\sqrt{24}=2\sqrt{6} \\ & AC=2\sqrt{6}+2\sqrt{6}=4\sqrt{6}cm \\\end{align}$

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Year of Exam: