Introduction To Trigonometric Ratios Page 2
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1
2
3Trigonometry cont.
“soh, cah, toa”
sine X = opposite leg
hypotenuse
cosine X = adjacent leg
hypotenuse
hypotenuse
tangent X = opposite leg =
opposite
adjacent leg
leg
angle X
adjacent leg
If you know the angle measure of “x” and any one side, you can find the other sides
using a trig ratio.
sin(60º) = ?/10
cos(52º) = 3/?
.8660 = ?/10
3
?*cos(52º) = 3
?
10
8.66 = ?
52º
? = 3/cos(52º) = 4.87
60º
?
Try these:
7
?
8
61º
49º
?
First, decide which ratio you need. Then write an equation involving the information you
know. On the calculator, push the sin/cos/tan button and then type the angle and hit enter.
Be sure you are in degree mode. Put this value into your ratio equation and solve for the
unknown side length.
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