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Geometry Notes
Lesson 5.3B Trigonometry
T.2.G.6 Use trigonometric ratios (sine, cosine,
tangent) to determine lengths of sides and
measures of angles in right triangles including
angles of elevation and angles of depression
T.2.G.7 Use similarity of right triangles to
express the sine, cosine, and tangent of an
angle in a right triangle as a ratio of given
lengths of sides
Solving for unknown values
Steps:
1. Label the sides as: opposite, adjacent,
hypotenuse.
2.
Decide which trig ratio is needed:
(sine, cosine, or tangent).
3.
Set up Equation
4.
Use Calculator to Solve.
Example #1 :
Find x. Round your answer to the
nearest tenth.
57
x
50
Example #2
Find x. Round your answer to the
nearest tenth.
51
18
x
Example #3
Find x. Round your answer to the
nearest tenth.
3
x
46
Example #4
Find x. Round your answer to the
nearest tenth.
x
31
18
Now You Try…
Find x. Round your answer to the
nearest tenth.
x
3
46
Now You Try…
Find x. Round your answer to the
nearest tenth.
x
31
18