Trigonometry Examples

$- \frac{8 π}{5}$

Step 1

Convert the radian measure to degrees.

Tap for more steps...

Step 1.1

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

$(- \frac{8 π}{5}) \cdot \frac{180 °}{π}$

Step 1.2

Cancel the common factor of $π$ .

Tap for more steps...

Step 1.2.1

Move the leading negative in $- \frac{8 π}{5}$ into the numerator.

$\frac{- 8 π}{5} \cdot \frac{180}{π}$

Step 1.2.2

Factor $π$ out of $- 8 π$ .

$\frac{π \cdot - 8}{5} \cdot \frac{180}{π}$

Step 1.2.3

Cancel the common factor.

$\frac{π \cdot - 8}{5} \cdot \frac{180}{π}$

Step 1.2.4

Rewrite the expression.

$\frac{- 8}{5} \cdot 180$

Step 1.3

Cancel the common factor of $5$ .

Tap for more steps...

Step 1.3.1

Factor $5$ out of $180$ .

$\frac{- 8}{5} \cdot (5 (36))$

Step 1.3.2

Cancel the common factor.

$\frac{- 8}{5} \cdot (5 \cdot 36)$

Step 1.3.3

Rewrite the expression.

$- 8 \cdot 36$

Step 1.4

Multiply $- 8$ by $36$ .

$- 288$

Step 1.5

Convert to a decimal.

$- 288 °$

Step 2

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

$72$

Step 3

The angle is in the first quadrant.

Quadrant $1$

Step 4