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After stepping into a room with unusual lighting, Anna's pupil has a diameter of 8 millimeters8\,\text{millimeters}. What is the pupil's radius?\newline_____\_\_\_\_\_ millimeters

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Q. After stepping into a room with unusual lighting, Anna's pupil has a diameter of 8 millimeters8\,\text{millimeters}. What is the pupil's radius?\newline_____\_\_\_\_\_ millimeters
  1. Identify formula for radius: Step 11: Identify the formula to find the radius from the diameter.\newlineThe formula to find the radius rr from the diameter dd is r=d2r = \frac{d}{2}.\newlineHere, diameter dd = 88 millimeters.
  2. Calculate radius: Step 22: Calculate the radius using the formula.\newlineRadius r=82=4r = \frac{8}{2} = 4 millimeters.

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