An exterior angle of a triangle is 80° and the interior opposite angles are in the ratio 1 : 3, measure of interior opposite angles are
10⁰, 50⁰
30⁰, 50⁰
20⁰, 60⁰
40⁰, 40⁰
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the angles are 2o nd 60, its option c
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We know that,
An exterior angle of a triangle is equal to the sum of the two opposite interior angles.
Here, exterior angle = 80°
ratio of opposite interior angles are 1:3
Let,
Common ratio is = x
So angles are x and 3x
According to the question,
So 1st angle = x = 20°
2nd angle =3x=3×20 =60°
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