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Question
In the following, find the marked unknown angle:
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Solution
Since, sum of all angles of triangle = 180°
1st Triangle 50° + 80° + b = 180°
⇒ 130°+ &= 180°
⇒ b = 180° – 130°
b = 50°
II nd Triangle 40° + 45° + a = 180°
⇒ 85° + a = 180°
⇒ a = 180° - 85
a = 95°
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