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Find the measure of an interior and exterior angle at the vertex of an isosceles triangle measures .

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Interior angle

degree, exterior angle

degree

Interior angle

degree, exterior angle

degree

Interior angle

degree, exterior angle

degree

Interior angle

degree, exterior angle

degree

answer is A.

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Detailed Solution

Concept- An isosceles triangle refers to a triangle with two equal-length sides. The angles apart from the apex angle are equal in size among the three interior angles.
Consider

as the exterior angle at vertex (in degrees).
Then, we can say that the exterior angle and the interior angle at vertex create a linear pair.
So,

We know the 2 base angles of an isosceles triangle are the same.
We represent each as

.
By angle sum property,

Therefore, base angle

and exterior angle

Hence, the correct answer is option 1) interior angle

degree, exterior angle

degree.

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Find the measure of an interior and exterior angle at the vertex of an isosceles triangle measures .

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