Understanding Angles and Measurements

What is the total number of degrees at a point?

• 360 degrees

• 270 degrees

• 90 degrees

• 180 degrees

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

• 120°

• 180°

• 90°

• 260°

What is the sum of angles on a straight line?

• 90 degrees

• 45 degrees

• 180 degrees

• 360 degrees

If one angle on a straight line is 120°, what is the measure of the other angle?

• 30°

• 60°

• 150°

• 90°

Define complementary angles.

• Complementary angles are angles that are adjacent to each other.

• Complementary angles are two angles that sum to 90 degrees.

• Complementary angles are two angles that are equal in measure.

• Complementary angles are two angles that sum to 180 degrees.

If one angle is 40°, what is the measure of its complementary angle?

• 70°

• 60°

• 50°

• 30°

Define supplementary angles.

• Supplementary angles are angles that are adjacent to each other.

• Supplementary angles are two angles that are equal in measure.

• Supplementary angles are two angles that sum to 90 degrees.

• Supplementary angles are two angles that sum to 180 degrees.

If one angle is 75°, what is the measure of its supplementary angle?

• 135°

• 120°

• 90°

• 105°

How many degrees are in a right angle?

• 90 degrees

• 45 degrees

• 120 degrees

• 60 degrees

Using a protractor, how would you measure a 90° angle?

• Align the protractor's baseline with one side of the angle and mark the 90° point.

• Draw a line from the protractor's center to the 0° mark and measure the angle from there.

• Place the protractor upside down and measure from the other side of the angle.

• Align the protractor's baseline with the vertex of the angle and read the measurement directly.