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According to triangle exterior angle theorem, "exterior angle of a triangle is equal to sum of opposite interior angles".
As per this, option A is true.
angle a + angle d is sum of interior angles.
Exterior angle is 60° since that triangle is equilateral
As per this, option A is true.
angle a + angle d is sum of interior angles.
Exterior angle is 60° since that triangle is equilateral
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