triangle sum theorem the sum of the angle measures in a triangle is 180 degrees

Triangle Sum Theorem The sum of the angle measures in a triangle is 180 degrees.

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Triangle Sum Theorem

The sum of the angle measures in a triangle is 180 degrees.

Isosceles Trianglesa triangle with at least 2 congruent sides

Page 3: Triangle Sum Theorem The sum of the angle measures in a triangle is 180 degrees

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.

Page 4: Triangle Sum Theorem The sum of the angle measures in a triangle is 180 degrees

Isosceles Triangle Theorem

If two sides of a triangle are congruent, the angles opposite them are congruent.

Page 5: Triangle Sum Theorem The sum of the angle measures in a triangle is 180 degrees

Converse Isosceles Triangle Theorem

If two angles of a triangle are congruent, the sides opposite them are congruent.

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