1. Trigonometry Welcome to Camp SOH-CAH-TOA
Trig Ratios to solve right triangles

2. Sine (abbreviated as Sin) Cosine (abbreviated as Cos)
Trigonometry Ratios
Sine (abbreviated as Sin)
Cosine (abbreviated as Cos)
Tangent (abbreviated as Tan)

3. Used to find angles or missing sides of right triangles
“SOH”
“CAH”
“TOA”

4. A 13 12 B 5 C Sin A = the side opposite angle A hypotenuse
Cos A = the side adjacent to angle A
Tan A = the side opposite to angle A
the side adjacent angle A
We can also find the sin, cos and tan of angle B.
We NEVER use sin, cos, or tan of the right angle (try this on your calculator & you’ll see why)

5. Use the Trig Ratio Slides to answer the following questions
Use the Trig Ratio Slides to answer the following questions. Put the letter of the correct answer in the blank.
Trig Ratios #1
SinA _____
CosB_____
SinB _____
Tan A _____
Tan B _____
Trig Ratios #2
Tan A ____
Cos C ____
SinB _____
Cos A _____
Tan B ______

6. Trigonometry Ratios #1 12 13 5 A C B A) C) D) B)
E) None of the above

7. Trigonometry Ratios #2 C 8 B A) C) 6 D) B) 10
E) None of the above A

8. To use a calculator… first be sure your calculator is in “degree” mode
Angle decimal Use the sin, cos, tan keys on your calculator Ex. Sin 65= ______ Type sin, 65, enter Round the decimal to 4 places
Decimal angle Use sin-1, cos-1, or tan-1 You need to use the 2nd key here. Ex. Cos A = Type 2nd, cos, .2493, enter Round degrees to the nearest tenth.

9. Calculator Practice
Use a calculator to find each value. Round to the nearest ten-thousandths.
sin 92.4 =
tan 27.5 =
cos 64.8 =
Find the measure of the angle to the nearest tenth of a degree.
sin B = angle =
tan A = angle =
cos R = angle =