Angles B, ABC or CBA A B C

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Presentation transcript:

Angles B, ABC or CBA A B C An angle is formed by two rays that share a common endpoint. A side vertex interior B C exterior side An angle can be named by its vertex or by three letters. B, ABC or CBA

How many angles have their vertex at S? U An angle cannot be named by its vertex if more than one angle share the same vertex.

Numbers can be used to name angles. 2 1 3 4 E D ABE and 1 name the same angle.

Angle Measure The measure of an angle is a measure of rotation.

Congruent Angles mX = mY X  Y If two angles have the same measure, they are congruent. X Y 50º 50º mY = 50º mX = 50º mX = mY measure of X  Y

A  C Congruent angles can be marked in a diagram with arcs. In the diagram, A  C