Understanding Angles for Grade 5

What type of angle measures less than 90 degrees?

• Obtuse angle

• Right angle

• Acute angle

• Straight angle

How do you use a protractor to measure an angle?

• Align the protractor's midpoint with the angle's vertex and read the measurement where the other side intersects the scale.

• Measure the angle by counting the number of degrees without using the protractor.

• Place the protractor upside down and measure from the bottom edge.

• Use the protractor to draw the angle instead of measuring it.

Classify the angle of 45 degrees: acute, obtuse, or right?

• acute

• straight

• reflex

• obtuse

What type of angle measures more than 90 degrees but less than 180 degrees?

• Obtuse angle

• Straight angle

• Right angle

• Acute angle

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

• Complementary angles

• Supplementary angles

• Adjacent angles

• Vertical angles

Measure the angle shown on the protractor: 120 degrees. What type is it?

• Acute angle

• Right angle

• Straight angle

• Obtuse angle

What is the sum of the angles in a triangle?

• 360 degrees

• 120 degrees

• 180 degrees

• 90 degrees

If one angle is 30 degrees and another is 60 degrees, what is the measure of the third angle?

• 75 degrees

• 45 degrees

• 120 degrees

• 90 degrees

How many degrees are in a straight angle?

• 360 degrees

• 90 degrees

• 45 degrees

• 180 degrees

Classify the angle of 180 degrees: acute, obtuse, or straight?

• reflex

• right

• straight

• acute