U2 D2 Calculating the Missing Side Using Trig Ratios.notebook
Calculating the Missing Side Using Trig Ratios
(SOHCAHTOA)
When you are solving for a missing side using trigonometry,
you may need to calculate the sine, cosine or tangent of an
angle.
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For example: sin68 is a number. It may look like an unknown
value, but IT IS A NUMBER (usually with many decimals) that
can be evaluated using your calculator.
February 24, 2017
Examples: Calculate the
value of each to three
decimal places:
a) sin68ο = ________________
b) tan47ο= _______________
c) cos12ο= _______________
RECALL: When rounding, look at the number after the place you want to round. If the number is 5 or greater the number you are rounding increases by one. Otherwise, it remains the same. EX: 0.9876
I want to round the 7. Beside it is a 6, so my final answer is Answer: 0.988
Feb 24­8:36 AM
Remember, you reviewed how to cross multiply last unit.
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Feb 24­8:37 AM
Steps in solving for a missing side:
1. Label the right­triangle according to the angle of interest.
2. Mark the side you are looking for with an x.
3. Choose the appropriate trig ratio.
4. Cross multiply to solve for x.
Feb 24­8:42 AM
Feb 24­8:47 AM
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