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Isosceles triangle

/aɪsˈɒsəlˌiːz tɹˈaɪaŋɡəl/

/aɪsˈɑːsəlˌiːz tɹˈaɪæŋɡəl/

Isosceles triangle

01

a type of triangle that has two sides of equal length and two angles of equal measure

Example

In an isosceles triangle, the base angles opposite the equal sides are congruent.

The sum of the interior angles of an isosceles triangle is always 180 degrees.

An equilateral triangle is a special case of an isosceles triangle where all three sides and angles are equal.

The altitude drawn from the vertex angle of an isosceles triangle bisects the base into two equal segments.

If the angles of an isosceles triangle are labeled A, B, and C, and side AB is congruent to side BC, then angle A is congruent to angle C.