Finding Unknown Angle Measures

Calculate the measure of the obtuse angle in an obtuse triangle with angles measuring 45° and 60°.

• 75

• 105

• 90

• 30

In an obtuse triangle, if one angle measures 100° and the other measures 30°, what is the measure of the third angle?

• 80°

• 120°

• 45°

• 50°

If an obtuse triangle has angles measuring 75° and 85°, what is the measure of the third angle?

• 100°

• 20°

• 60°

• 45°

In a right triangle, if one angle measures 30°, what is the measure of the other acute angle?

• 120°

• 60°

• 90°

• 45°

Find the measure of the missing angle in a right triangle with angles measuring 45° and 90°.

• 45°

• 60°

• 30°

• 180°

If one angle in a right triangle measures 60°, what is the measure of the other acute angle?

• 45°

• 30°

• 120°

• 90°

Identify the measure of each angle in an equilateral triangle.

• 60 degrees

• 45 degrees

• 120 degrees

• 90 degrees

In an equilateral triangle, if one angle measures 60°, what is the measure of the other two angles?

• 90°

• 45°

• 60°

• 120°

If an equilateral triangle has an angle measuring 80°, what are the measures of the other two angles?

• 100°

• 90°

• 80°

• 60°

Calculate the measure of each angle in an isosceles triangle with a base angle of 50°.

• 120°

• 65°

• 40°

• 90°