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To convert degrees to radians, we use the following formula:

\[
\text{{Radians}} = \text{{Degrees}} \times \left( \frac{\pi}{180^\circ} \right)
\]

In this case, you are asked to convert **90°** to radians. Let's apply the formula:

\[
90^\circ \times \frac{\pi}{180^\circ} = \frac{\pi}{2} \text{ radians}
\]

So, **90° = \(\frac{\pi}{2}\) radians**.

Would you like more details on this conversion process?

Here are some related questions you may find useful:
1. How do you convert any angle from radians to degrees?
2. Why is \(\pi\) involved in converting between degrees and radians?
3. What is the radian measure of a full circle (360°)?
4. How do you simplify fractions when converting degrees to radians?
5. What are some real-world applications of radian measure?

**Tip**: Always remember, \(\pi\) radians equals 180°, so you can use that as a reference point for conversions!

Convert the following degree measure to radian measure: 90°

Learn how to convert 90 degrees to radians using the formula Degrees × (π / 180). This example demonstrates basic trigonometry concepts, suitable for students in Grades 9-10. The result is π/2 radians.

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