Unit 3 Vocabulary Practice

Acute Triangle

• A triangle with two congruent sides

• A triangle with one right angle

• A triangle with three acute angles

• A triangle with three congruent sides and 

  three congruent angles

Equilateral/Equiangular Triangle

• A triangle with three congruent sides and 

  three congruent angles

• A triangle with one right angle

• A triangle with two congruent sides

• A triangle with three acute angles

Right Triangle

• A triangle with one right angle

• A triangle with no congruent sides

• A triangle with one obtuse angle

Isosceles Triangle Theorem

• The sum of the measures of the angles of a triangle is 180o

• If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

• The measure of an exterior angle of a 

  triangle is equal to the sum of the two 

  remote interior angles

• A triangle with three congruent sides and 

  three congruent angles

Scalene Triangle

• A triangle with one obtuse angle

• A triangle with three acute angles

• A triangle with three congruent sides and 

  three congruent angles

• A triangle with no congruent sides

Isosceles Triangle

• A triangle with three congruent sides and 

  three congruent angles

• A triangle with three congruent sides and 

  three congruent angles

• A triangle with two congruent sides

• A triangle with one right angle

Obtuse Triangle

• A triangle with three acute angles

• A triangle with one obtuse angle

• A triangle with one right angle

• A triangle with two congruent sides

Triangle Angle Sum

• If two sides of a triangle are congruent, then the angles opposite those sides are congruent

• A segment that passes through the midpoint 

  of another segment at a right angle

• The sum of the measures of the angles of a triangle is 180 degrees

• The measure of an exterior angle of a 

  triangle is equal to the sum of the two 

  remote interior angles

Exterior Angle Theorem

• A segment that passes through the midpoint 

  of another segment at a right angle

• If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

• The measure of an exterior angle of a 

  triangle is equal to the sum of the two 

  remote interior angles

• A triangle with one right angle

Perpendicular Bisector

• A segment that passes through the midpoint 

  of another segment at a right angle

• A line segment joining a vertex and 

  the midpoint of the opposite side

• A triangle with two congruent sides

• The measure of an exterior angle of a 

  triangle is equal to the sum of the two 

  remote interior angles