Do Now: Solve for x. Calculate the measure of all three angles, and identify each angle as acute, obtuse, or right. <ABC with ray BD. <ABD = (x – 21),

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Presentation transcript:

Do Now: Solve for x. Calculate the measure of all three angles, and identify each angle as acute, obtuse, or right. <ABC with ray BD. <ABD = (x – 21), <DBC = 25, <ABC = 3x – 100

Vocabulary Congruent Angles: Two angles are congruent if they have the same measure.

Angle Bisector A ray that divides an angle into 2 congruent adjacent angles. BD is an angle bisector of <ABC. B A C D

Ex: If FH bisects  EFG & m  EFG=120 o, what is m  EFH? G H E F

Example: If both angles are congruent, solve for x. x+40 o 3x-20 o * If they are congruent, set them equal to each other, then solve! x+40 = 3x = 2x = 2x 30 = x

Practice (10 Minutes) Page and 40-42

Segment and Angle Addition Postulate Review Each member of the group must complete one step of each problem on the board. When the last person is done, s/he must put the answer on the whiteboard and hold it up for Sis. Uchenna to see it!