Use the triangle given to find the following trig ratios.

1. sin(θ)2. cos(θ)3. tan(θ)

Solve for x in the proportions below.4. 5.

Warm Up 1/20

Get out a colored pen and last night’s homework

Check Homework

Quiz Friday over Trig!

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sin(θ) =

cos(θ) =

tan(θ) =

Trig Ratios Review

First we need to be in _____________ mode. (Always check before using Trig) Go to the scratchpad Hit the doc▼ button Click 7: Settings and Status Click 2: Document Settings Find where it says “Angle:”

o Choose Degree from the drop down menu Click “Make Default” Select OK

Calculators!DEGREES

Second we need to know our ________________(θ). The calculator has information stored in it for every possible angle measure, so we can easily find the trig ratio for the problems below. Find the trig button on your calculator (under ctrl) Select the trig function you wish to use Input the angle measure into the parentheses Hit enter and round your answer to the nearest

hundredth

Calculators!Reference Angle

Practice

sin(36) = _______ cos(45) = _______ tan(18) = _______ sin(54) = _______ cos(23) = _______ tan(81) = _______

***Round to the nearest hundredth

1. Mark the _______________ angle (θ)…usually the one given – but never the right angle!

 1. Label the two given ___________ in relation to θ (opp, adj, or hyp). 1. Decide which ________________ you can use from

SOHCAHTOA. 1. Write the equation, using a ______________ for the missing side.  Set up a __________________ and solve for the variable (using

cross multiplication)

Finding a Missing Sidereference

sides

Trig function

variable

proportion

1. Mark the reference angle: θ = 342. Label the given sides in relation

to θ: opp. and hyp.3. Decide which trig function to use:

Sine4. Write the equation using x for the

missing side5. Set up a proportion and cross

multiply  

1. Mark the reference angle: θ = 752. Label the given sides in relation to

θ: adj. and hyp.3. Decide which trig function to use:

Cosine4. Write the equation using x for the

missing side5. Set up a proportion and cross

multiply

EX 2: Find x. (This one is a little different!)

Work with a shoulder partner

Cut apart the problem cards

Match each picture and equation with the corresponding scenarios given below

What Can We Do Activity!

WS – Trig with a Calculator◦ Odds Only

Quiz Friday!

Homework