Question

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An exterior angle of a triangle is equal to the sum of its adjacent angle and one remote interior angle

An isosceles triangle is an equilateral triangle

An equilateral triangle is an isosceles triangle

Answer 1

sometimes. exterior angle of a triangle is equal to the sum two remote interior angles. But in a special case when the adjacent angle is equal to the remote interior angle, it is true

sometimes. Only when the isosceles triangle is equilateral

always. This is always true by definition.