do now: solve for x. calculate the measure of all three angles, and identify each angle as acute,...
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 & mEFG=120o, what is mEFH?
G
H
E
F
o602
120
oEFHm 60
Example: If both angles are congruent, solve for x.
x+40o
3x-20o
* If they are congruent, set them equal to each other, then
solve!
x+40 = 3x-20
40 = 2x-20
60 = 2x
30 = x
Practice (10 Minutes)
Page 30
29-31 and 40-42
Segment and Angle Addition Postulate ReviewEach 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!
