1. Warm Up Use the following triangles: Find a if b = 10√2
Find b if a = 19
Find d and e if c = 4
Find c and d if e = 50√3 b d e a
60° a c

2. Geometry Sections 7.5 and 7.6 – SOHCAHTOA
Objective: SWBAT to apply Trigonometry ratios to find indirect measures.

3. Trigonometry
Sine, Cosine, and Tangent are trigonometry functions used to solve for sides and angles of a right triangle.
You can only take the sine, cosine, and tangent of an acute angle, NOT
A RIGHT ANGLE!!

4. Sine (abbreviation: sin)X Z Y

5. Cosine (abbreviation: cos)X Z Y

6. Tangent (abbreviation: tan)X Z Y

7. SOHCAHTOA A
1.)
2.)
3.)
4.)
5.)
6.) 5 3 C B 4

8. Use your calculator and round to the nearest hundredth.
1.) sin 42o =
2.) cos 58o =
3.) tan 18o =
= .67
= .53
= .32

9. Solve for the variable. Given opposite, find adjacent
Given hypotenuse, find adjacent
Given hypotenuse, find opposite
tan 20 =
cos 50 =
sin 42 =
.3640 =
.6428 =
.6691 =
.364x = 8
c = 4.7
a = 6.4
x = 22.0

10. Solve for the variable. tan 40 = sin 48 = tan 55 = .8391 = .7431 ==
x = 16.8
k = 15.6
x = 42.8

11. Solve for the variable cos 35 = tan 45 = tan 60 = .8192 = 1.0 ==
f = 9.82=9.8
x = 25.0
x = 8.66=8.7