1. Suppose S is between R and T
Suppose S is between R and T. Use the Segment Addition Postulate or sum of the parts = whole or the add two parts of a line together thing to solve for the variable.
RS = 12, ST = 2x, RT = 34 1.
RS = 16, ST = 2x, RT = 5x+10 2. 3.
RS = 4y-1, ST = 2y-1, RT = 5y 4.
RS = 2z+6, ST = 4z-3, RT = 5z+12

2. Find the value of the variable and PB, if P is between A and B.
AP=-2s, PB=s+8, AB=11 1.

3. Lesson 1-4
Learners will be able to measure and classify angles, congruent angles, and angle bisectors.

4. A ray is a part of a line. It has one endpoint and extends indefinitely in one direction.
Rays are named stating the endpoint first and then any other point on the ray.

5. If you choose a point on a line, you make exactly two rays called opposite rays.Z Y X Y Z
Name the 2 Rays…

6. An angle is the intersection of two noncollinear rays at a common endpoint.
The common endpoint is called the vertex, and the rays are the sides of the angle.

7. An angle can be named by a single letter… ex: B
Or by three letters: a point on one side, the vertex, and a point on the other side.… ex: ABC

8. There is an interior and an exterior of an angleZ B C W
Where is point Z? W? C?

9. Angles are measured in degrees.
What are degrees?
Da sun
1 of a circle
360

10. Logically where is a 45 angle?
A right angle is an angle with a measurement of 90
Logically where is a 45 angle?

11. Obtuse: which have a measurement greater than 90
There are two other types of angles beside right angles….
90 < mABC < 180 A C B
Obtuse: which have a measurement greater than 90

12. Acute: which have a measurement lesser than 90
There are two other types of angles beside right angles…. A
mABC < 90 C B
Acute: which have a measurement lesser than 90

13. Just like with congruent sides we also have congruent anglesB

14. A ray or line that divides an angle into two congruent angles is called an angle bisector

15. A ray or line that divides an angle into two congruent angles is called an angle bisector

16. Homework: Lesson 1-4, p. 33 # 4-36 even 42, 50