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JAMB Mathematics 2017 Paper

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Question : 22

Total: 44

In the figure, find x

40^o
55^o
50^o
60^o

Solution:

Concept:

The angles at a point sum to

360^\circ

.

Explanation:

The given angles are

2x

,

3x

, and

4x

.

Sum of angles at a point is

360^\circ

.

So,

2x + 3x + 4x = 360^\circ

.

Add the like terms:

9x = 360^\circ

.

Divide both sides by

9

:

x = \frac{360}{9}

.

Therefore,

x = 40^\circ

.

Answer:

x = 40^\circ

Correct option: A.

40^\circ

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