Measuring Angles in Grade 5

What is the difference between an acute angle and an obtuse angle?

• An acute angle is more than 90 degrees; an obtuse angle is exactly 180 degrees.

• An acute angle is exactly 90 degrees; an obtuse angle is less than 90 degrees.

• An acute angle is less than 90 degrees; an obtuse angle is more than 90 degrees but less than 180 degrees.

• An acute angle is less than 45 degrees; an obtuse angle is more than 180 degrees.

Identify whether a 45-degree angle is acute or obtuse.

• reflex

• straight

• acute

• right

Using a protractor, measure the angle shown in the image.

• 45 degrees

• 30 degrees

• 90 degrees

• 60 degrees

What is the measure of an angle that is 120 degrees? Is it acute or obtuse?

• Right

• Acute

• Straight

• Obtuse

If two angles are opposite each other, what can you say about their measures?

• The measures of opposite angles are always different.

• The measures of opposite angles are equal.

• The measures of opposite angles are complementary.

• The measures of opposite angles are supplementary.

In a triangle, if one angle measures 50 degrees and another measures 60 degrees, what is the measure of the third angle?

• 100 degrees

• 80 degrees

• 70 degrees

• 90 degrees

How do you use a protractor to measure an angle?

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

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

• 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 on the protractor's edge.

If angle A is 30 degrees and angle B is 70 degrees, what is the sum of angle A and angle B?

• 110 degrees

• 100 degrees

• 80 degrees

• 90 degrees

What type of angle is formed by two lines that meet at a right angle?

• Right angle

• Straight angle

• Obtuse angle

• Acute angle

If a triangle has angles measuring 30 degrees and 90 degrees, what is the measure of the third angle?

• 75 degrees

• 90 degrees

• 60 degrees

• 45 degrees