Question 22

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waecmaths question: 

From the diagram, find the value of x

Option A: 

40

Option B: 

30

Option C: 

20

Option D: 

20

waecmaths solution: 

The total angles in a pentagon is 540o\[\begin{align}  & {{90}^{\circ }}+{{(180-5x)}^{\circ }}+{{(180-3x)}^{\circ }}+{{120}^{\circ }}+{{130}^{\circ }}={{540}^{\circ }} \\ & 8x={{160}^{\circ }} \\ & x={{20}^{\circ }} \\\end{align}\]

maths year: