Question

Find the value of x.

Answer 1

x = 80°

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Explanation:

58° + 42° + x = 180° -- (Δ sum property)

100° + x = 180°

x = 180° - 100°

x = 80°

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Answer 2

80°

Explanation:

42° + 58° + x = 180° [Angle sum property of triangle]

=> 100 + x = 180

=> x = 180 - 100

=> x = 80 (Ans)