Measuring Angles with a Protractor

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

How do you measure an angle with a protractor?

Back

To measure an angle with a protractor, align the baseline of the protractor with one side of the angle, ensuring the center point of the protractor is at the vertex of the angle. Then, read the measurement where the other side of the angle intersects the protractor scale.

Front

What is the measurement of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is the measurement of a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is the difference between acute and obtuse angles?

Back

An acute angle measures less than 90 degrees, while an obtuse angle measures more than 90 degrees but less than 180 degrees.

Front

What type of angle measures exactly 0 degrees?

Back

A zero angle measures exactly 0 degrees.

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Front

How can you identify an angle greater than 90 degrees?

Back

An angle greater than 90 degrees is classified as an obtuse angle. You can identify it by measuring it with a protractor.

Front

What is the sum of angles in a triangle?

Back

The sum of the interior angles in a triangle is always 180 degrees.

Front

What is the complementary angle of a 30-degree angle?

Back

The complementary angle of a 30-degree angle is a 60-degree angle, as complementary angles sum to 90 degrees.