 Welcome Back 
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:
3
sinq =
5
Setting Up Trig Equations
x
45°
4 cm
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?
Setting Up Trig Equations
x
12 ft
30°
1. Which trig function would we use here?
2. What would the equation look like?
Solving Trig Equations
x
tan 45° =
4
x
sin30° =
12
What if it looks like this…
sin30° =
12
x
What if we are are trying to solve for the angle?
20 m
β
40 m
Which Trig function should we use?
Practice
4
sina =
5
4
cosa =
5
T.O.D.
Finish #’s 1, 9, 17 and have me check them
before you leave.
hundredth.