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High School Math : Trigonometry

Study concepts, example questions & explanations for High School Math

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8 Diagnostic Tests 613 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #4 : Understanding Radians And Conversions

How many radians are in $85^\circ$ ?

Possible Answers:

$\frac{9}{4}\pi$

$\frac{4}{9}\pi$

$\frac{3}{5}\pi$

$\frac{17}{36}\pi$

$\frac{36}{17}\pi$

Correct answer:

$\frac{17}{36}\pi$

Explanation:

Since there are $\pi$ radians for every $180^\circ$ , we can set up a proportion to solve.

$\frac{85^\circ}{x}=\frac{180^\circ}{\pi}$

Cross multiply.

$85^\circ*\pi=180^\circ *x$

Divide both sides by $180^\circ$ .

$\frac{85^\circ}{180^\circ}*\pi=x$

$\frac{17}{36}\pi=x$

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Example Question #2 : Understanding Radians And Conversions

How many radians are in $270^\circ$ ?

Possible Answers:

$2\pi$

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

$\pi$

$\frac{5\pi}{2}$

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

Correct answer:

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

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{270^\circ}{x}=\frac{180^\circ}{\pi}$

Cross multiply:

$270^\circ*\pi=180^\circ*x$

Isolate :

$\frac{270^\circ}{180^\circ}\pi=x$

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

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Example Question #1 : Understanding Radians And Conversions

How many degrees are in $\frac{\pi}{3}$ radians?

Possible Answers:

$540^\circ$

$15^\circ$

$45^\circ$

$30^\circ$

$60^\circ$

Correct answer:

$60^\circ$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{x^\circ}{\frac{\pi}{3}}=\frac{180^\circ}{\pi}$

Cross multiply:

$x^\circ*\pi=180^\circ*\frac{\pi}{3}$

Divide both sides by $\pi$ :

$x^\circ=\frac{180^\circ}{3}$

$x^\circ=60^\circ$

Report an Error

Example Question #1771 : High School Math

How many degrees are in $\frac{8\pi}{3}$ radians?

Possible Answers:

$420^\circ$

$460^\circ$

$480^\circ$

$120^\circ$

$30^\circ$

Correct answer:

$480^\circ$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{x^\circ}{\frac{8\pi}{3}}=\frac{180^\circ}{\pi}$

Cross multiply:

$x^\circ*\pi=180^\circ*\frac{8\pi}{3}$

Notice that the $\pi$ 's cancel out:

$x^\circ=180^\circ*\frac{8}{3}$

$x^\circ=480^\circ$

Report an Error

Example Question #2 : Understanding Radians And Conversions

How many degrees are in $\frac{3\pi}{4}$ radians?

Possible Answers:

$405^\circ$

$135^\circ$

$225^\circ$

$180^\circ$

$45^\circ$

Correct answer:

$135^\circ$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{x^\circ}{\frac{3\pi}{4}}=\frac{180^\circ}{\pi}$

Cross multiply:

$x^\circ*\pi=180^\circ*\frac{3\pi}{4}$

Notice that the $\pi$ 's cancel out:

$x^\circ=180^\circ*\frac{3}{4}$

$x^\circ=135^\circ$

Report an Error

Example Question #41 : Trigonometry

How many degrees are in $\frac{2\pi}{3}$ radians?

Possible Answers:

$150^\circ$

$120^\circ$

$60^\circ$

$210^\circ$

$180^\circ$

Correct answer:

$120^\circ$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{x^\circ}{\frac{2\pi}{3}}=\frac{180^\circ}{\pi}$

Cross multiply:

$x^\circ*\pi=180^\circ*\frac{2\pi}{3}$

Notice that the $\pi$ 's cancel out:

$x^\circ=180^\circ*\frac{2}{3}$

$x^\circ=120^\circ$

Report an Error

Example Question #21 : The Unit Circle And Radians

How many degrees are in $\frac{5\pi}{6}$ radians?

Possible Answers:

$210^\circ$

$30^\circ$

$390^\circ$

$240^\circ$

$150^\circ$

Correct answer:

$150^\circ$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{x^\circ}{\frac{5\pi}{6}}=\frac{180^\circ}{\pi}$

Cross multiply:

$x^\circ*\pi=180^\circ*\frac{5\pi}{6}$

Notice that the $\pi$ 's cancel out:

$x^\circ=180^\circ*\frac{5}{6}$

$x^\circ=150^\circ$

Report an Error

Example Question #41 : Trigonometry

How many radians are in $120^\circ$ ?

Possible Answers:

$\frac{\pi}{2}$

$2\pi$

$6\pi$

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

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

Correct answer:

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

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{120^\circ}{x}=\frac{180^\circ}{\pi}$

Cross multiply:

$120^\circ*\pi=180^\circ*x$

Isolate :

$\frac{120^\circ}{180^\circ}\pi=x$

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

Report an Error

Example Question #23 : The Unit Circle And Radians

How many radians are in $360^\circ$ ?

Possible Answers:

$\pi^2$

$2\pi$

$\pi$

$\frac{\pi}{2}$

$4\pi$

Correct answer:

$2\pi$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{360^\circ}{x}=\frac{180^\circ}{\pi}$

Cross multiply:

$360^\circ*\pi=180^\circ*x$

Isolate :

$\frac{360^\circ}{180^\circ}\pi=x$

$2\pi=x$

Report an Error

Example Question #24 : The Unit Circle And Radians

How many radians are in $405^\circ$ ?

Possible Answers:

$\frac{4\pi}{9}$

$\frac{9\pi}{4}$

$\frac{2\pi}{9}$

$\frac{3\pi}{4}$

$\frac{\pi}{4}$

Correct answer:

$\frac{9\pi}{4}$

Explanation:

The conversion for radians is $180^\circ=\pi$ , so we can make a ratio:

$\frac{405^\circ}{x}=\frac{180^\circ}{\pi}$

Cross multiply:

$405^\circ*\pi=180^\circ*x$

Isolate :

$\frac{405^\circ}{180^\circ}\pi=x$

$\frac{9\pi}{4}=x$

Report an Error

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High School Math : Trigonometry

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #4 : Understanding Radians And Conversions

Example Question #2 : Understanding Radians And Conversions

Example Question #1 : Understanding Radians And Conversions

Example Question #1771 : High School Math

Example Question #2 : Understanding Radians And Conversions

Example Question #41 : Trigonometry

Example Question #21 : The Unit Circle And Radians

Example Question #41 : Trigonometry

Example Question #23 : The Unit Circle And Radians

Example Question #24 : The Unit Circle And Radians

All High School Math Resources

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