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In a triangle with two congruent sides, which is known as an isosceles triangle, the angle formed by these two sides is called the vertex angle. The other two angles, which are at the base of the triangle, are congruent to each other. The sum of all angles in any triangle is always 180 degrees, so the vertex angle can be calculated by subtracting the sum of the base angles from 180 degrees.

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What is the vertex angle on an isosceles triangle?

the top angle the angle formed by the two congruent sides


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