isosceles triangle
Plural
isosceles triangles
1
a type of triangle that has two sides of equal length and two angles of equal measure
- In an isosceles triangle, the base angles opposite the equal sides are congruent.
- 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.
- The altitude drawn from the vertex angle of an isosceles triangle bisects the base into two equal segments.
- An equilateral triangle is a special case of an isosceles triangle where all three sides and angles are equal.
- The sum of the interior angles of an isosceles triangle is always 180 degrees.