1. Answers to homework (page 11 in packet) problems
PQ=
PR=
QR=

3. Warm-up Fill in the blanks. The endpoint of is _________.
Line segments with equal measures are _____________.
A rule of geometry that is accepted without proof is a ______________.
A pair of opposite rays form a ____________. R
congruent
postulate
line

4. Objective: Students will be able to use angle postulates and classify angles.
An angle consists of 2 rays share by a common initial point. The common point is called vertex. The two rays are called sides. B
vertex A
sides C

5. A B C
interior
exterior A B C
interior
exterior

6. Acute and Obtuse Angles
The measure of an acute angle is greater than 00 but less than 900. A B C
The measure of an obtuse angle is less than 1800 but greater than 900.

7. Right and Straight AnglesB
The measure of a right angle is exactly 900. C A
The measure of a straight angle is exactly 1800. C B A

8. Angle Addition Postulate
Adjacent Angles R
800 P S
680 T
is adjacent to
Angle Addition Postulate

9. Congruent Angles O D G A B C
730

10. YOUR TURN! (1-4)Draw and carefully label the figures.
Acute angle SAM with a measure of 450.
Right angle RTE
Obtuse angle BIG with angle bisector
Q is in the interior of angle ROS. S is in the interior of angle QOP.
Find the measure of each angle. ∠SAM is a straight angle. S M A E
(2x)o
(6x+1)o

11. A S M R T E B I G S O R Q P Acute angle SAM with a measure of 450.
Right angle RTE
Obtuse angle BIG with angle bisector
Q is in the interior of angle ROS. S is in the interior of angle QOP.
Find the measure of each angle. ∠SAM is a straight angle. R T E B I G S O R Q P