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Warm- Up1. Find the sine, cosine and
tangent of A.2. Find x.
12 x
51°
6
810
A
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Find the trigonometric ratios.D
O G
5
12
13
sin D =
tan D =
cos D =
sin G =
tan G =
cos G =
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Find the missing variables.
6 feet43.2°
x
y
12.9
25°
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Finding an angle.(Figuring out which ratio to use and getting
to use the 2nd button and one of the trig buttons.)
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Let A be an acute angle in a right triangle. Approximate the measure of A to the
nearest degreesinA=.36 cosA=.42
Let’s practice using the calculator!
2nd cos
.36
.42
sin 2nd
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Ex. 1: Find . Round to four decimal places.
9
17.2
Make sure you are in degree mode (not radian).
9
2.17tan
2nd tan 17.2 9
3789.62
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Ex. 2: Find . Round to three decimal places.
23
7
Make sure you are in degree mode (not radian).
23
7cos
2nd cos 7 23
281.72
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Ex. 3: Find . Round to three decimal places.
400
200
Make sure you are in degree mode (not radian).
400
200sin
2nd sin 200 400
30
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When we are trying to find a sidewe use sin, cos, or tan.
When we are trying to find an angle we use sin-1, cos-1, or tan-1.