Angle Basics

Acute angles are ​ (a)   90 degrees.

• less than
• greater than
• exactly

Obtuse angles are ​ (a)   90 degrees.

• greater than
• less than
• exactly

Right angles are ​ (a)   90 degrees.

• exactly
• less than
• greater than

Straight angles have a measure of exactly ​ (a)  

• 180 degrees
• 45 degrees
• 360 degrees
• 90 degrees
• 75 degrees

A ​ (a)   has four right angles and four ​ (b)   sides.

• square
• congruent
• opposite
• triangle
• long
• diagonal
• pentagon
• hexagon

Which polygon has four right angles?

• triangle

• trapezoid

• hexagon

• rectangle

Match the following

• acute angle

• 
• straight angle

• 
• obtuse angle

• 
• right angle

• 

Describe the angles of this octagon.

• 8 right angles

• 8 acute angles

• 8 straight angles

• 8 obtuse angles

Describe the angles of this triangle.

• 1 right angle, 2 obtuse angles

• 3 right angles

• 1 right angle, 2 acute angles

• 3 acute angles

Describe the angles in this trapezoid.

• 2 right angles, 2 obtuse angles

• 2 obtuse angles, 2 acute angles

• 2 acute angles, 2 straight angles

• 1 acute angle, 2 obtuse angles, 1 right angle