Question 29

loading...

Prev/Next links

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: 

$6\sqrt{6}cm$

Option B: 

$2\sqrt{6}cm$

Option C: 

$3\sqrt{6}cm$

Option D: 

$4\sqrt{6}cm$

Jamb Maths Solution: 

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

Jamb Maths Topic: 
Year of Exam: