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\[\begin{align} & {{90}^{\circ }}+{{(180-5x)}^{\circ }}+{{(180-3x)}^{\circ }}+{{120}^{\circ }}+{{130}^{\circ }}={{540}^{\circ }} \\ & 8x={{160}^{\circ }} \\ & x={{20}^{\circ }} \\\end{align}\]
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