The exterior angle of a triangle is 80° & one of its interior opposite angles is 20°, than other angle is _______.
a.) 90° b.) 80° c.) 70° d.) straight.
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The exterior angle of a triangle is 80° & one of its interior opposite angles is 20°, than other angle is _______.
a.) 90° b.) 80° c.) 70° d.) straight.
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Answer:
Let the interior angles be x and 3x
We know that exterior angle of triangle is equal to sum of interior opposite angles.
⇒x+3x=80
∘
⇒4x=80
∘
⇒x=20
∘
So the angles are
x=20
∘
3x=3×20
∘
=60
∘
So option C is correct.
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