Straight Angles, Acute Angles, Obtuse Angles

An obtuse angle is...

• less than 90 degrees.

• exactly 90 degrees.

• greater than 90 degrees and less than 180 degrees.

• exactly 180 degrees.

A straight angle is...

• less than 90 degrees.

• exactly 90 degrees.

• greater than 90 degrees and less than 180 degrees.

• exactly 180 degrees.

A right angle is...

• less than 90 degrees.

• exactly 90 degrees.

• greater than 90 degrees and less than 180 degrees.

• exactly 180 degrees.

An acute angle is...

• less than 90 degrees.

• exactly 90 degrees.

• greater than 90 degrees and less than 180 degrees.

• exactly 180 degrees.

Right, acute, or obtuse?

• Acute
• Right
• Obtuse

Right, acute, or obtuse?

• Right
• Acute
• Obtuse

Determine if the angle is acute, obtuse, or straight.

86º

• right

• obtuse

• acute

Determine if the angle is acute, obtuse, or straight.

75º

• acute

• obtuse

• right

Determine if the angle is acute, obtuse, or straight.

90º

• obtuse

• right

• acute

Determine if the angle is acute, obtuse, or straight.

132º

• acute

• obtuse

• right