1. Trig Ratios C 5 2 A M 4. If C = 20º, then cos C is equal to:
Be sure to discuss if C = 20, then sin C would equal ?
4. If C = 20º, then cos C is equal to:
A. sin 70 B. cos 70 C. tan 70

2. Skills Check

3. UNIT QUESTION: What patterns can I find in right triangles?
GSE Geometry Day 27 ( )
UNIT QUESTION: What patterns can I find in right triangles?
Standard: MCC9-12.G.SRT.6-8
Today’s Question:
How do we use trig ratios to find the missing sides of a triangle?

4. Finding a missing side. (Figuring out which ratio to use and getting to use a trig button.)

5. Ex: 6. Figure out which ratio to use. Find x
Ex: 6 Figure out which ratio to use. Find x. Round to the nearest tenth.
20 m x A O

6. Ex: 7 Find the missing side. Round to the nearest tenth.
80 ft x O A

7. Ex: 8 Find the missing side. Round to the nearest tenth.

8. Ex: 9 Find the missing side. Round to the nearest tenth.
20 ft x A

9. When we are trying to find a side we use sin, cos, or tan.
When we are trying to find an angle we use (INVERSE) sin-1, cos-1, or tan-1.

10. Classwork
Missing Sides WS

11. Homework
Missing Sides SPW