Understanding Angles and Their Properties

What are the three main types of angles?

• straight, reflex, complementary

• vertical, adjacent, supplementary

• linear, circular, polygonal

• acute, right, obtuse

How many degrees are in a right angle?

• 360 degrees

• 180 degrees

• 90 degrees

• 45 degrees

What type of angle measures less than 90 degrees?

• Obtuse angle

• Straight angle

• Acute angle

• Right angle

What is the term for an angle that measures exactly 180 degrees?

• Straight angle

• Obtuse angle

• Acute angle

• Right angle

If two angles add up to 90 degrees, what are they called?

• Vertical angles

• Complementary angles

• Supplementary angles

• Adjacent angles

What do you call angles that are opposite each other when two lines intersect?

• Supplementary angles

• Vertical angles

• Complementary angles

• Adjacent angles

What is the measure of a straight angle?

• 180 degrees

• 45 degrees

• 360 degrees

• 90 degrees

If an angle measures 45 degrees, what type of angle is it?

• reflex angle

• acute angle

• right angle

• obtuse angle

What is the relationship between complementary angles?

• Their measures can be any positive angles.

• They are always equal in measure.

• The sum of their measures is 180 degrees.

• The sum of their measures is 90 degrees.

How do you measure an angle using a protractor?

• To measure an angle using a protractor, align the baseline with one side of the angle and read the degree measurement where the other side intersects the scale.

• Use a ruler to measure the length of the angle's sides instead of the angle itself.

• Place the protractor upside down and read the measurement from the bottom scale.

• Draw a straight line through the angle and measure its length with the protractor.