Acute Obtuse Right Straight Angles

If two of the angles of a triangle are 30 and 70 degrees, the third angle measures...

• 80

• 100

• 60

• 90

An angle that measures less than 90°

• Acute

• Obtuse

• Right

• Straight

This is what kind of angle?

• right

• acute

• obtuse

• straight

Which type of angle is pictured?

• Acute

• Right

• Obtuse

• Straight

If m∠1 = 30°, then m∠3 = 

• 30°

• 60°

• 150°

• undetermined

Find the missing angle.  Find x.

• 20^o

• 70^o

• 160^o

• 180^o

This is what kind of angle?

• obtuse

• right

• straight

• acute

• Cannot be determined