Lessons 5.1-5.2 Practice

Classify the triangle by its sides.

• Equilateral

• Isosceles

• Scalene

Classify the triangle by its sides.

• Equilateral

• Isosceles

• Scalene

Classify the triangle by its sides.

• Equilateral

• Isosceles

• Scalene

Classify the triangle by its angles.

• Acute

• Equiangular

• Obtuse

• Right

Classify the triangle by its angles.

• Acute

• Equiangular

• Obtuse

• Right

Classify the triangle by its angles.

• Acute

• Equiangular

• Obtuse

• Right

Set up an equation to solve for x.

• 2x + 5 + 35 = x - 10

• 2x + 5 + 35 = x - 10

• x - 10 + 2x + 5 + 35 = 180

• x - 10 + 2x + 5 = 35

Set up an equation to solve for x.

• 7x + 5 + 60 + 20x = 180

• 7x + 5 + 60 + 20x = 90

• 60 + 20x = 7x + 5

• 7x + 5 + 60 = 20x

Theorem 5.4: If two angles of one triangle are congruent to two angles of another triangle, then their third pair of angles are also congruent.

• Exterior Angle Theorem

• Corollary to the Triangle Sum Theorem

• Triangle Sum Theorem

• Third Angles Theorem

Theorem 5.1: The sum of the measures of the interior angles of a triangle is 180 degrees.

• Exterior Angle Theorem

• Corollary to the Triangle Sum Theorem

• Triangle Sum Theorem

• Third Angles Theorem