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Exterior Angle of a Triangle = Sum of Opposite Internal Angles

An exterior a...

Question

An exterior angle of a triangle is 80^o and two interior opposite angles are equal. Measure of each of these angle is:

A

100^o

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B

60^o

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C

40^o

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D

120^o

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Solution

The correct option is C
40^o

Since, Sum of two interior opp. angles = Measure of ext. angle

Therefore, Sum of two interior opp. angles = 80^o

Hence, the measure of each angle = 40^o.

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