Calculate the unmarked angles in each figure:
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Answer:
a+40+90=180
a+130=180
a=180-130
a=50
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Assumption:
Let the given triangle be ∆ABC right-angled at B.
According to the question:
∠B = 90° [right angled]
∠C = 40°
As we know that the sum of all angles in a triangle is 180°
∠A = 180° - (90° + 40°)
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