Question 26

loading...

Prev/Next links

Jambmaths question: 

From the diagram above, find the value of x correct to one decimal place

Option A: 

20cm

Option B: 

$\sqrt{304}cm$

Option C: 

$\sqrt{108}cm$

Option D: 

10cm.

Jamb Maths Solution: 

$\begin{align}  & \text{Using cosine rule} \\ & {{x}^{2}}={{8}^{2}}+{{12}^{2}}-2(12)(8)\cos {{120}^{\circ }} \\ & {{x}^{2}}=64+144+96=304c{{m}^{2}} \\ & x=\sqrt{304}cm \\\end{align}$

Jamb Maths Topic: 
Year of Exam: