8th grade Ch 5 L3

Find the value of x in the triangle.

• x = 45°

• x = 60°

• x = 30°

• x = 90°

What is the value of x in the sail of the sailboat at the right?

• x = 90°

• x = 60°

• x = 45°

• x = 120°

The measures of the angles of △LMN are in the ratio 1:2:5. What are the measures of the angles?

• 20°, 40°, 100°

• 15°, 30°, 135°

• 25°, 50°, 105°

• 30°, 60°, 90°

Find the value of x in the triangle.

• x = 65°

• x = 45°

• x = 90°

• x = 30°

To find the missing measure of an angle in a triangle if you know the measure of two of the interior angles, you should:

• Subtract the sum of the two known angles from 180 degrees.

• Add the two known angles together.

• Multiply the two known angles.

• Divide 180 degrees by the sum of the two known angles.

The top of a kite is shown below. What is the value of x?

• x = 55°

• x = 45°

• x = 65°

• x = 35°

A popular toy puzzle is shown below. What is the value of x?

• x = 57°

• x = 43°

• x = 62°

• x = 35°

The measures of the angles of △RST are in the ratio 2:4:9.

• The angles are 20°, 40°, and 90°.

• The angles are 30°, 60°, and 90°.

• The angles are 18°, 36°, and 126°.

• The angles are 24°, 48°, and 108°.

The measures of the angles of △XYZ are in the ratio 3:3:6. What are the measures of the angles?

• The angles are 45°, 45°, and 90°.

• The angles are 30°, 60°, and 90°.

• The angles are 60°, 60°, and 60°.

• The angles are 20°, 70°, and 90°.

Find the value of x in each triangle.

• x = 24°

• x = 36°

• x = 48°

• x = 60°