Using the Pythagorean Theorem where l is the length of the legs. ABC can be divided into two congruent triangles by drawing line segment AD, which is also the height of triangle ABC. Refer to triangle ABC below.ĪB ≅ AC so triangle ABC is isosceles. The base angles of an isosceles triangle are the same in measure. The figure below shows these parts of an isosceles triangle. The altitude from the base of an isosceles triangle to its opposite vertex divides the triangle into two congruent right triangles. Altitude - the perpendicular distance from the vertex of a triangle to the opposite side.Base angle - the angles adjacent to the base of the isosceles triangle these are the two congruent angles.Vertex angle - the angle opposite the base of the isosceles triangle.
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