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## TRIGONOMETRY

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### is the mathematics of right triangles. ... hypotenuse. adjacent. tan q = sin q = q. R. Y. X. Y. R. X. R. opposite. Y. X. angle of interest ... – PowerPoint PPT presentation

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Title: TRIGONOMETRY

1
TRIGONOMETRY
Yvonne M. Conley, SSND Roman Catholic HS
2
General Information
3
• Trigonometry
• is the mathematics of right triangles.
• can be used to determine unknown distances that
are not easily measured with a ruler.
• can be used to determine an unknown angle.
• there are six standard functions
• sin (sine) cos (cosine)
• tan (tangent) cot (cotangent)
• sec (secant) csc (cosecant)

4
Trigonometric Functions
5
opposite side
R
Y
angle of interest
q
X
opposite
Y
X
cos q
sin q
R
R
hypotenuse
hypotenuse
opposite
Y
tan q
X
6
b
angle of interest
R
Y
X
opposite side
opposite
Y
X
cos b
sin b
R
hypotenuse
hypotenuse
R
opposite
X
tan b
Y
7
Problem-Solving Strategy
8
Draw a right triangle. Write in the data provided
including units. Write the question. Write an
equation. Solve the problem.
9
Sample Problems
10
b
Calculate the sin of q and the sin of b.
25.0 m
20.0 m
q
15.O m
sin q ?
sin b ?
x/r
sin b
sin q
y/r
sin q 20.0 m/ 25.0 m
sin b 15.0 m/ 25.0 m
sin q 0.800
sin b 0.600
11
b
Calculate the cos of q and the cos of b.
25.0 m
20.0 m
q
15.O m
cos q ?
cos b ?
x/r
cos q
y/r
cos b
cos q 15.0 m/ 25.0 m
cos b 20.0 m/ 25.0 m
cos q 0.600
cos b 0.800
12
b
Calculate the tangent of q and the tangent of b.
25.0 m
20.0 m
q
15.O m
tan q ?
tan b ?
y/x
tan q
x/y
tan b
tan q 20.0 m/ 15.0 m
tan b 15.0 m/ 20.0 m
tan q 1.33 ...
tan b 0.750
13
Using the inverse of the trig. functions,
determine angle q .
b
25.0 m
20.0 m
tan-1 y/x q
tan-1 20.0m/15.0m q
q
53.1o q
15.O m
sin-1 y/r
q
cos-1 x/r q
cos-1 15.0m/25.0m q
sin-1 20.0m/25.0m q
53.1o q
53.1o q
14
Using the inverse of the trig. functions,
determine angle b .
b
25.0 m
20.0 m
tan-1 x/y b
tan-1 15.0m/20.0m b
q
15.O m
36.9o b
sin-1 x/r
b
cos-1 y/r b
cos-1 20.0m/25.0m b
sin-1 15.0m/25.0m b
36.9o b
36.9o b
15
Determine the length of an unknown distance x.
b
25.0 m
sin q y/r cos q x/r tan q y/x
?? m
q 30.0 o
?? m
tan q y/x
x y/ tan q
x 25.0 m/ tan 30.0 o
x 43.3 m
x 25.0 m / 0.577
16
b
Calculate the tangent of q and the tangent of b.
25.0 m
20.0 m
q
15.O m
y/x
tan q
x/y
tan b
tan q 20.0 m/ 15.0 m
tan b 15.0 m/ 20.0 m
tan q 1.33 ...
tan b 0.750
17
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