Download Triangle Sum Theorem

Triangle Sum Theorem
The sum of the angle measures
in a triangle is 180 degrees.
Isosceles Triangles
a triangle with at least 2 congruent sides
Isosceles Triangle
• The congruent sides are called the legs of a
triangle.
• The angle formed by the legs is the vertex
angle.
• The side of the triangle opposite the vertex
angle is the base.
• The angles that have the base as a side are
the base angles.
Isosceles Triangle Theorem
If two sides of a triangle are congruent, the
angles opposite them are congruent.
Converse Isosceles Triangle
Theorem
If two angles of a triangle are congruent, the
sides opposite them are congruent.