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Find the Angle Measure X In the Given Figure - 3 - Exterior Angle of a Triangle and Its Property

Find the angle measure x in the given Figure

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Solution

From the figure, it can be concluded that,

70 + a = 180° (Linear pair)

a = 110°

60° + b = 180° (Linear pair)

b = 120°

Sum of the measures of all interior angles of a pentagon is 540º.

Therefore, in the given pentagon,

120° + 110° + 30° + x + x = 540°

260° + 2x = 540°

2x = 280°

x = 140°

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