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The vertical angle of an isosceles triangle is 100°. Find its base angles

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The vertical angle of an isosceles triangle is 100°. Find its base angles.

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Consider an isosceles ΔABC such that AB=AC

Given that vertical angle A is 100°.

Given to find the base angles

Since ΔABC is isosceles

∠B=∠C    [Angles opposite to equal angles are equal]

And also,

Sum of the interior angles of a triangle = 180°

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