Pythagorean Theorem, Isosceles Right Triangles, Trigonometric Ratios Worksheet Page 20
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30To help you remember these relationships, you can use the phrase ________ _______ ________.
The trigonometric ratios are written in an equation form. (**Hint: Write these ratios at the top of EVERY page
you are working on.)
Sine x ° =
Cosine x ° =
Τ
angent x
° =
USE THE TRIANGLE AT THE RIGHT to determine the following trigonometric ratios.
a°
Ex 4. sin 40° =
Ex 5. sin a° =
n
Ex 6. cos 40° =
Ex 7. cos a° =
10
Ex 8. tan 40° =
Ex 9. tan a =
40º
30
Use the triangle at the right to write all of the following trigonometric equations.
72°
From 72 °
From 18 °
x
27
18º
55
Use Trigonometric Ratios to Solve for Missing Sides and Angles
1) Determine which Trig Ratio will fit your information.
2) Set up the Trig Ratio
3) Round to the nearest degree if it is an angle and round to the nearest hundredth for sides.
Ex 1.
31
25
n
°
Ex2.
Ex 3.
25
51
w
°
17
z
°
28
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