Trigonometry Examples

$- \frac{7 π}{4}$

Step 1

Convert the radian measure to degrees.

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Step 1.1

To convert radians to degrees, multiply by $\frac{180}{π}$ , since a full circle is $360 °$ or $2 π$ radians.

$(- \frac{7 π}{4}) \cdot \frac{180 °}{π}$

Step 1.2

Cancel the common factor of $π$ .

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Step 1.2.1

Move the leading negative in $- \frac{7 π}{4}$ into the numerator.

$\frac{- 7 π}{4} \cdot \frac{180}{π}$

Step 1.2.2

Factor $π$ out of $- 7 π$ .

$\frac{π \cdot - 7}{4} \cdot \frac{180}{π}$

Step 1.2.3

Cancel the common factor.

$\frac{π \cdot - 7}{4} \cdot \frac{180}{π}$

Step 1.2.4

Rewrite the expression.

$\frac{- 7}{4} \cdot 180$

Step 1.3

Cancel the common factor of $4$ .

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Step 1.3.1

Factor $4$ out of $180$ .

$\frac{- 7}{4} \cdot (4 (45))$

Step 1.3.2

Cancel the common factor.

$\frac{- 7}{4} \cdot (4 \cdot 45)$

Step 1.3.3

Rewrite the expression.

$- 7 \cdot 45$

Step 1.4

Multiply $- 7$ by $45$ .

$- 315$

Step 1.5

Convert to a decimal.

$- 315 °$

Step 2

For angles smaller than $0 °$ , add $360 °$ to the angle until the angle is larger than $0 °$ .

$45$

Step 3

The angle is in the first quadrant.

Quadrant $1$

Step 4