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Isosceles Triangles

Properties of triangles with two equal sides.

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Isosceles Triangles

Vocabulary

Base Angles

Base Angles

The base angles of an isosceles triangle are the angles formed by the base and one leg of the triangle.
Base Angles Theorem Converse

Base Angles Theorem Converse

The base angles theorem converse states if two angles in a triangle are congruent, then the sides opposite those angles are also congruent.
Isosceles Triangle Theorem

Isosceles Triangle Theorem

The Isosceles Triangle Theorem states that the perpendicular bisector of the base of an isosceles triangle is also the angle bisector of the vertex angle.
Triangle Sum Theorem

Triangle Sum Theorem

The Triangle Sum Theorem states that the three interior angles of any triangle add up to 180 degrees.
Vertical Angles

Vertical Angles

Vertical angles are a pair of opposite angles created by intersecting lines.

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