Chapter 10 - NCPN
Chapter 10 - NCPN
Chapter 10 - NCPN
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Using a Calculator<br />
A scientific calculator can be used to evaluate trigonometric functions of<br />
different angles. Make sure your calculator is in degree mode if the angle<br />
measure is given in degrees and in radian mode if the angle measure is given<br />
in radians.<br />
Example 4<br />
Using a Calculator<br />
Use a calculator to evaluate y = tan θ for θ = 160°. Round your answer to<br />
the nearest thousandth.<br />
Solution<br />
Be sure the calculator is in DEGREE mode. Then press the key and<br />
enter the angle measure, 160. Note that on some scientific calculators, the<br />
measure of the angle is entered first.<br />
tan 160° ≈ –0.364<br />
Ongoing Assessment<br />
Use a calculator to evaluate each trigonometric expression. Round to the<br />
nearest thousandth. Be sure the calculator is in RADIAN mode. see margin<br />
a. cos 2 ≠<br />
7<br />
Lesson Assessment<br />
Think and Discuss<br />
b. sin ≠ 4<br />
c. tan 2p<br />
1. Explain how to convert an angle measure from radians<br />
to degrees.<br />
see margin<br />
2. Describe how to find the measure of a central angle if the<br />
circumference of the circle and the length of the intercepted arc<br />
are known.<br />
3. What is the x-coordinate of the point where the terminal side of<br />
an angle, θ, intersects the unit circle<br />
4. Describe in your own words what the value of tan θ means as it<br />
pertains to the unit circle.<br />
5. What is the y-coordinate of the point where the terminal side of<br />
an angle, θ, intersects the unit circle<br />
6. Which trigonometric function has a value of 1 for θ = 45°<br />
<strong>10</strong>.2 Evaluating Trigonometric Functions 445
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