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Lesson Plan

EQ: How do we solve for a missing piece of the trig puzzle?

Agenda:• Warm Up• Partner Worksheet• Notes on Solving Trig Equations

Homework:• Worksheet on Inverse Trig Equations

Warm Up

What are the 6 trig functions and their ratios?

sine, cosine, tangent, cosecant, secant, cotangent

sinθ = opp/hyp

cosθ = adj/hyp

tanθ = opp/adj

cscθ = hyp/opp

secθ = hyp/adj

cotθ = adj/opp

Partner Worksheet

• Everyone gets the same worksheet• Partner 1 odds, Partner 2 evens• Complete your half and check with key• Ask me/your neighbors if you don’t

understand some of them• You’re now the Master of those problems• Complete the other half of the worksheet• Meet with your partner, check each other’s

answers and work together to help your partner Master all problems

Let’s review the pieces…

• Opposite, adjacent and hypotenuse all refer to what?

• θ, β, α, A, B, X, and Y all refer to what?• To sum it up:

Setting Up Trig Equations

What if we do know the measure of one of the acute angles but are missing a side?1. Which trig function would we use here?

2. What would the equation look like?

45°

x

4 cm

Setting Up Trig Equations

1. Which trig function would we use here?

2. What would the equation look like?

30°

x12 ft

Solving Trig Equations

What if it looks like this…

What if we are are trying to solve for the angle?

β20 m

40 mWhich Trig function should we use?

Practice

T.O.D.

Finish #’s 1, 9, 17 and have me check them before you leave.

hundredth.