1. Bellwork (Turn in on Brown Desk)

2. 1.5b Assumptions Students will be able to determine whether a given statement may or may not be assumed.

3. Can Assume…

4. Can’t Assume…(unless marked)

5. Example 1 Based solely on the diagram, can you conclude… 1. is a straight angle? 2. is a right angle? 3.A, B, and C are collinear? 4. ? 5. ? 6.B is between A and C? 7. bisects ?

6. Example 2 One complementary angle is 6 less than twice the other. What is the measure of the smaller angle?

7. Example 3 If, find x.

8. Example 4 One of two supplementary angles is 8 more than 3 times the other. What is the measure of the larger angle?

9. Straight angle and lines Congruent segments Relative sizes of angles or segments Collinearity A, B and C are collinear. Right angles Congruent angles Betweenness Points B is between points C and A. Determine whether you can or can’t assume the following statements. Then write each of these on one of the next two slides.

12. Homework Pg. 45 # 8 – 13, 17, 18, 21, 23, 24, 26, 29, 36, 49, 51