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MPM 2D
Solving Right Triangles using Trig. Ratios
SOH CAH TOA
1. Review: For any right triangle with an acute angle θ, the three basic
trig. ratios are:
sin θ =
θ
cos θ =
tan θ =
2. Using your calculator solve for the unknown angle.
a) sin A = 0.75
b) cos B = ­0.5
c) tan θ = 3.4
"What is the angle whose sine is 0.75?"
3. Solve each of the following triangles for the unknown value.
a)
b)
x
9
40o
7 cm
20
θ
Since we need (H) and we know
the value of (O), use sinθ.
.
We know (A) and (H)
therefore use cosθ.
Trigonometry Worksheet 1 Right Triangle Trigonometry Solve each of the triangles for the missing side(s) or angle(s). Round to one decimal where necessary. 1. 2. 4. 7. Homework: 1. Complete the worksheets.
2. page 348 #1(c), 2(c)
3. 5. 6. 8.