Angles and Lines

An instrument for measuring angles

• Compass

• Protractor

• Degree

• Ruler

An angle that measures less than 90°

• Acute

• Obtuse

• Right

• Straight

• acute
• obtuse
• right

• acute
• obtuse
• right

Find the missing angle.  Find x.

• 20^o

• 70^o

• 160^o

• 180^o

If m∠1 = 30°, then m∠3 = 

• 30°

• 60°

• 150°

• undetermined

Q1. What is the capital of France?

• A) 15

• B) 16

• C) 18

• D) 19

Find the m∠1

• 67

• 113

• 180

• 23

This is what kind of angle?

• obtuse

• right

• straight

• acute

An angle whose measure is exactly 90 degrees.

• acute

• vertical

• right

• straight