. Find radian measure of an angle of $90^{\circ}$ . Enter the radian to be between 0 and
(Enter an exact answer. Use symbolic notation and fractions where needed.)
$r =$

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Answer

Final Answer: The radian measure of an angle of $90^{\circ}$ is $\frac{π}{2}$ .

Steps

Step 1 ：Given an angle of 90 degrees, we are asked to find its radian measure.

Step 2 ：We know that $1^{\circ} = \frac{π}{180}$ radians.

Step 3 ：So, to convert 90 degrees into radians, we multiply 90 by $\frac{π}{180}$ .

Step 4 ：This gives us a radian measure of $\frac{π}{2}$ .

Step 5 ：Final Answer: The radian measure of an angle of $90^{\circ}$ is $\frac{π}{2}$ .