Precalculus Examples

$90 °$

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

$90 ° \cdot \frac{π}{180 °}$ radians

Cancel the common factor of $90$ .

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Factor $90$ out of $180$ .

$90 \cdot \frac{π}{90 (2)}$ radians

Cancel the common factor.

$90 \cdot \frac{π}{90 \cdot 2}$ radians

Rewrite the expression.

$\frac{π}{2}$ radians

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