Lesson to be used with complementary and supplementary angles topic.

1. COMPLEMENTARY &
SUPPLEMENTARY
ANGLES
1.5 Describing angle pair
relationships:
Mr. Saucedo
Milby High School

2. OBJECTIVE
We will use angle
relationships to find
angle measures.

3. VOCABULARY
ADJACENT ANGLES
Definition
 Two angles that share a common vertex and common side.
Visual
adjacent non adjacent

4. VOCABULARY:
COMPLEMENTARY ANGLES
Definition
 Two angles that add up to 90 degrees.
Visual

5. VOCABULARY
SUPPLEENTARY ANGLES
Definition
 Two angles that add up to 180 degrees.
Visual

6. CHECKPOINT
TRUE OR FALSE?
 Angle ABC and CBD are complementary.
 Angle KHJ and IHJ are supplementary
 Angle CBD and angle KHJ are adjacent.

7. CHECKPOINT
True or false?
 <ABC and <DBC are
complementary?

8. HOW TO REMEMBER?

9. CHECKPOINT
What is the relationship between angles 1 and 2?

10. GUIDED EXAMPLES
Given that angle a is a complement of angle b and
that m<a = 68, find m<b.

11. GUIDED EXAMPLES
Given that m<2 is a supplement of <2,
and m<2 = 56, find m<1.

12. GUIDED EXAMPLES
Given that the two angles below are complementary;
and that m<FED=4x + 8, and m<CBA = x + 2, find
the measure of each angle.

13. BIG QUESTIONS
How do we identify (or prove) that two angles are
complementary?
How do we identify (or prove) that two angles are
supplementary?
Adjacent angles share a _____ and a ________.

14. INDEPENDENT WORK
TEXTBOOK, Page 38
PROBLEMS: 1, 4, 5, 6, 8, 10, 12, 14, 16, 18,
34, 35, 36, 37, 38.

15. HOMEWORK
WORKBOOK, Page13
PROBLEMS: 1, 3, 5, 7, 17, 22, 23, 24, 25, 29
Pre-AP: Add problem #38.