Trigonometry Examples

$\frac{9 π}{4}$

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.

$(\frac{9 π}{4}) \cdot \frac{180 °}{π}$

Step 1.2

Cancel the common factor of $π$ .

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Step 1.2.1

Factor $π$ out of $9 π$ .

$\frac{π \cdot 9}{4} \cdot \frac{180}{π}$

Step 1.2.2

Cancel the common factor.

$\frac{π \cdot 9}{4} \cdot \frac{180}{π}$

Step 1.2.3

Rewrite the expression.

$\frac{9}{4} \cdot 180$

Step 1.3

Cancel the common factor of $4$ .

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Step 1.3.1

Factor $4$ out of $180$ .

$\frac{9}{4} \cdot (4 (45))$

Step 1.3.2

Cancel the common factor.

$\frac{9}{4} \cdot (4 \cdot 45)$

Step 1.3.3

Rewrite the expression.

$9 \cdot 45$

Step 1.4

Multiply $9$ by $45$ .

$405$

Step 1.5

Convert to a decimal.

$405 °$

Step 2

For angles greater than $360 °$ , subtract $360 °$ from the angle until the angle is less than $360 °$ .

$45$

Step 3

The angle is in the first quadrant.

Quadrant $1$

Step 4