find the measure of the Angle ABC in each of the Following figures using property of the given figure
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sum of all angle of Pentagon = 540°
so angle b = 540- 420= 120
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It is a pentagon.
The sum of interior angles of a pentagon=540°
∴ ∠A+∠B+∠C+∠D+∠E=540°
100°+∠B+80°+110°+130°=540°
∠B+420°=540°
∠B=540°-420°
∠B=120°
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