1-4 Measuring Angles. Angle: Named by 1) its vertex (if it is the only angle at the vertex) 2) 3 points (vertex in the middle) 3) a number inside the.

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Presentation transcript:

1-4 Measuring Angles

Angle: Named by 1) its vertex (if it is the only angle at the vertex) 2) 3 points (vertex in the middle) 3) a number inside the angle R S T 2 Formed by two rays that share the same endpoint

E1 Where is Point Q? R S T Interiorexterior Q E B C A 2 1 E2 What are the 2 other names for < 2? E3 Could you call any of the angles < B?

Angles are measured in degrees. We use a protractor to measure angles. Find the measure of each angle. E4  AOD E5  EOC E6  FOA E7  BOC

You classify angles by their measure. Acute angle: Right angle: Obtuse angle: Straight angle: A An angle that is more than zero degrees and less than 90 degrees in measure An angle that is EXACTLY 90 degrees An angle that is more than 90 degrees and less than 180 degrees in measure An angle that is EXACTLY 180 degrees

Congruent Angles: 12 Angles that have the same measure

1 2 A B C E E8 Name the sides of ∡ 1. E9 Name the sides of ∡ 2. E10 Give another name for ∡ 1. E11 Give another name for ∡ 2.

A B C E

PWS 1-4 #’s 1-13, 19-29