Understanding Angles and Measurements

What type of angle measures less than 90 degrees?

• Acute angle

• Obtuse angle

• Reflex angle

• Straight angle

How many degrees are in a right angle?

• 45 degrees

• 360 degrees

• 90 degrees

• 180 degrees

Use a protractor to measure the angle shown: 45 degrees. True or False?

• 30 degrees

• 90 degrees

• 60 degrees

• True

What type of angle measures exactly 180 degrees?

• Obtuse angle

• Right angle

• Acute angle

• Straight angle

Estimate the size of this angle: Is it acute, right, or obtuse?

• straight

• reflex

• full

• acute

If angle A is 30 degrees and angle B is 60 degrees, which is larger?

• Angle B is larger.

• Angle A is 60 degrees.

• Both angles are equal.

• Angle A is larger.

What do you call an angle that measures more than 90 degrees but less than 180 degrees?

• Right angle

• Straight angle

• Acute angle

• Obtuse angle

Using a protractor, what is the measurement of a straight angle?

• 90 degrees

• 180 degrees

• 360 degrees

• 45 degrees

If two angles are complementary, what is the sum of their measures?

• 45 degrees

• 90 degrees

• 60 degrees

• 180 degrees

Classify the angle measuring 120 degrees. Is it acute, right, or obtuse?

• right

• obtuse

• straight

• acute