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Trigonometry : Radians and Conversions

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6 Diagnostic Tests 155 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #34 : Unit Circle And Radians

Simplify and give the followoing expression in degrees:

$2\pi-\frac{\pi}{4}$

Possible Answers:

$300^{\circ}$

$315^{\circ}$

$325^{\circ}$

$270^{\circ}$

$285^{\circ}$

Correct answer:

$315^{\circ}$

Explanation:

First we need to simplify the expression:

$2\pi-\frac{\pi}{4}=\frac{8\pi-\pi}{4}=\frac{7\pi}{4}$

Then multiply by $\frac{180^{\circ}}{\pi}$ :

$\frac{7\pi}{4}\times \frac{180^{\circ}}{\pi}=\frac{7\times 180^{\circ}}{4}=315^{\circ}$

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Example Question #21 : Circles

Simplify and give the followoing expression in degrees:

$\frac{\frac{2\pi}{7}+\frac{\pi}{14}}{\frac{1}{7}}$

Possible Answers:

$350^{\circ}$

$480^{\circ}$

$380^{\circ}$

$450^{\circ}$

$420^{\circ}$

Correct answer:

$450^{\circ}$

Explanation:

First we need to simplify the expression:

$\frac{\frac{2\pi}{7}+\frac{\pi}{14}}{\frac{1}{7}}=\frac{\frac{4\pi+\pi}{14}}{\frac{1}{7}}=\frac{5\pi}{2}$

Then multiply by $\frac{180^{\circ}}{\pi}$ :

$\frac{5\pi}{2}\times \frac{180^{\circ}}{\pi}=\frac{5\times 180^{\circ}}{2}=450^{\circ}$

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Example Question #32 : Unit Circle And Radians

Convert $\frac{2\pi}{3}$ radians to degrees.

Possible Answers:

$150^\circ$

$120^\circ$

$60^\circ$

$30^\circ$

$250^\circ$

Correct answer:

$120^\circ$

Explanation:

Use the conversion $\pi \textup{ radians}= 180\textup{ degrees}$ .

Since we are converting radians to degrees, multiply by 180 degrees and divide by $\pi$ radians.

$\frac{2\pi}{3} \textup{ radians}\left(\frac{180 \textup{ degrees}}{\pi\textup{ radian}}\right)= 120\textup{ degrees}$

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Example Question #22 : Circles

How many degrees is 3 radians?

Possible Answers:

None of these other answers.

$150^{\circ}$

$189^{\circ}$

$172^{\circ}$

$156^{\circ}$

Correct answer:

$172^{\circ}$

Explanation:

When going from radians to degrees one multiplies by the conversion factor

$\frac{180^{\circ}}{\pi rad}$ .

The radians cancel and the answer is left in degrees.

$3\hspace{1mm}{\color{Red} rad}\cdot\frac{180^{\circ}}{\pi {\color{Red} rad}}=\frac{540^\circ}{\pi}=172^{\circ}$

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Example Question #23 : Circles

Convert to radians: 33^o

Possible Answers:

0.576

0.183

0.058

0.189

1.736

Correct answer:

0.576

Explanation:

To convert to radians, set up the ratio $\frac{180}{\pi } = \frac{33} { x}$ :

$180 x = 33 \pi$

$x = 33 \pi \div 180 \approx 0.576$

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Example Question #24 : Circles

Convert to degrees: $\frac{2 \pi }{7}$

Possible Answers:

147.58^o

16.37^o

0.016^o

51.43^o

Correct answer:

51.43^o

Explanation:

To convert, divide by $\pi$ and multiply by 180 :

$\frac{2 \pi }{7 } \div \pi = \frac{2}{7}$

$\frac{2}{7} \cdot 180 \approx 51.47^o$

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Example Question #25 : Circles

$\frac{37\pi}{18}$ radians is equivalent to how many degrees?

Possible Answers:

$10^\circ$

$350^\circ$

$370^\circ$

$185^\circ$

Correct answer:

$370^\circ$

Explanation:

1 radian is equal to $\frac{180}{\pi}$ degrees. Using this conversion factor,

$\frac{37\pi}{18}\times\frac{180}{\pi}=37\times10=370$ .

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Example Question #421 : Trigonometry

Convert $150^{\circ}$ into radians.

Possible Answers:

$\frac{\pi}{6}$

$\frac{3\pi}{2}$

$\frac{\pi}{4}$

$\frac{10\pi}{6}$

$\frac{5\pi}{6}$

Correct answer:

$\frac{5\pi}{6}$

Explanation:

Recall that there are 360 degrees in a circle which is equivalent to $2\pi$ radians. In order to convert between radians and degrees use the relationship that,

$360^\circ=2\pi \Rightarrow 180^\circ=\pi$

Thus, in order to convert from degrees to radians you need to multiply by $\frac{\pi}{180}$ .

So in this particular case,

$150*\frac{\pi}{180}=\frac{5\pi}{6}$ .

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Example Question #201 : New Sat Math Calculator

Convert $330^{\circ}$ into radians.

Possible Answers:

$\frac{5\pi}{6}$

$\frac{7\pi}{5}$

$\frac{7\pi}{3}$

$\frac{11\pi}{6}$

$\frac{\pi}{3}$

Correct answer:

$\frac{11\pi}{6}$

Explanation:

Recall that there are 360 degrees in a circle which is equivalent to radians. In order to convert between radians and degrees use the relationship that, $360^\circ=2\pi \Rightarrow 180^\circ=\pi$

Thus, in order to convert from degrees to radians you need to multiply by . $\frac{\pi}{180}$

So in this particular case,

$330*\frac{\pi}{180}=\frac{11\pi}{6}$ .

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Example Question #31 : Radians

Convert $1^{\circ}$ into radians.

Possible Answers:

$\frac{\pi}{180}$

$2\pi$

$\pi$

$\frac{\pi}{90}$

$\frac{\pi}{360}$

Correct answer:

$\frac{\pi}{180}$

Explanation:

Recall that there are 360 degrees in a circle which is equivalent to radians. In order to convert between radians and degrees use the relationship that,

$360^\circ=2\pi \Rightarrow 180^\circ=\pi$ .

Thus, in order to convert from degrees to radians you need to multiply by $\frac{\pi}{180}$ .

So in this particular case,

$1*\frac{\pi}{180}=\frac{\pi}{180}$ .

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Trigonometry : Radians and Conversions

Study concepts, example questions & explanations for Trigonometry

All Trigonometry Resources

Example Questions

Example Question #34 : Unit Circle And Radians

Example Question #21 : Circles

Example Question #32 : Unit Circle And Radians

Example Question #22 : Circles

Example Question #23 : Circles

Example Question #24 : Circles

Example Question #25 : Circles

Example Question #421 : Trigonometry

Example Question #201 : New Sat Math Calculator

Example Question #31 : Radians

All Trigonometry Resources

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