Solving with Relationships in Triangles

The sum of the angle measures of a triangle is 180° 
m∠A + m∠B + m∠C = 180°

• Triangle Sum Theorem
• Exterior Angle Theorem
• Third Angle Theorem
• Centroid Theorem

The acute angles of a right triangle are

• supplementary
• linear
• complementary
• 60°

The measure of each angle of an equiangular triangle is 

• complementary
• supplementary
• 60°
• 45°

The measure of an exterior angle of a triangle is equal to the sum of the measures of its remote interior angles.
m∠4 = m∠1 + m∠2

• Triangle Sum Theorem
• Exterior Angle Theorem
• Third Angles Theorem
• Congruent Triangles Theorem

If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles are congruent.

• Triangle Sum Theorem
• Exterior Angle Theorem
• Third Angles Theorem
• Congruent Triangles Theorem

What is the correct congruence statement?  ΔDEC ≅________

• ΔAEB
• ΔEAB
• ΔBEA
• Not Congruent

Figures that have the same _____ and size are congruent triangles. 

• corresponding
• corners
• angles
• shape

Solve for x

• 30°
• 40°
• 50°
• 60°

Find the measure of angle A.

• 75^o
• 60^o
• 30^o
• 38^o

Find the measure of the indicated angle. 

• 34°
• 46°
• 62°
• 36°