the top angle
the angle formed by the two congruent sides
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To find the equal angels, base angles, of an isosceles triangle and you know the vertex angle, 180-vertex angle and then divide by two.
Vertex angle
The base angles of an isosceles triangle are congruent. The vertex angle of an isosceles triangle is not necessarily congruent to the base angles.
90 degrees. This is an isosceles right triangle, standing on its hypotenuse.
The base