Angles in Triangles

Front

What is the sum of the angle measures in a triangle?

Back

180°

Front

If two angles of a triangle are 30° and 70°, what is the measure of the third angle?

Back

80°

Front

Which of the following sets do NOT make a triangle: 60, 60, 60; 55, 65, 45; 45, 90, 45; 75, 40, 65?

Back

55, 65, 45

Front

Find the measure of the missing angle if one angle is 60° and another is 90°. What is the missing angle?

Back

30°

Front

What is the measure of an angle in a triangle if the other two angles are 36° and 54°?

Back

90°

Front

What is the definition of an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90°.

Front

What is the definition of an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

If one angle of a triangle is 110°, what is the maximum possible measure of the other two angles?

Back

The maximum possible measure of the other two angles is 70° each.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are equal.