One of the exterior angle
of a triangle is 135° and
the interior opposite
angles are in the ratio
4:5, then the angles are
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Ratio of interior opposite angles = 4:5
Exterior angle = 135°
Let the common part be x
4x + 5x = 135°
9x = 135°
x = 135 ÷ 9
= 15°
4x = 4 × 15
= 60°
5x = 5 × 15
= 75°
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