Measuring Angles with a Protractor

What defines the interior of an angle?

• The space outside the two lines forming the angle

• The space between the two lines forming the angle

• The point where the two lines meet

• The length of the lines forming the angle

What type of angle measures exactly 90 degrees?

• Acute angle

• Obtuse angle

• Straight angle

• Right angle

An angle more than 180 degrees but less than 360 degrees is called?

• Right angle

• Acute angle

• Straight angle

• Reflex angle

How many degrees are in a full rotation?

• 90 degrees

• 360 degrees

• 270 degrees

• 180 degrees

How do we measure the size of an angle?

• By counting squares

• Using a protractor

• Using a ruler

• With a compass

Which scale on a protractor is used for measuring an angle that opens to the left?

• The inner scale

• Neither scale

• The outer scale

• Both scales

What is the measure of a reflex angle ABC if angle CBD is a straight line and angle DBA is 45 degrees?

• 90 degrees

• 180 degrees

• 225 degrees

• 135 degrees

Two angles that add up to 90 degrees are called?

• Supplementary angles

• Complementary angles

• Obtuse angles

• Reflex angles

What is the complementary angle of a 30 degree angle?

• 120 degrees

• 90 degrees

• 150 degrees

• 60 degrees

If one angle is 70 degrees, what is its supplementary angle?

• 20 degrees

• 100 degrees

• 110 degrees

• 90 degrees