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After stepping into a room with unusual lighting, Anita's pupil has a diameter of $6$ millimeters. What is the pupil's area? $\newline$ Use $3.14$ for $\pi$ . If necessary, round your answer to the nearest hundredth. $\newline$ _____ square millimeters

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Circles: word problems

Full solution

Q. After stepping into a room with unusual lighting, Anita's pupil has a diameter of

6

millimeters. What is the pupil's area?

\newline

Use

3.14

for

\pi

. If necessary, round your answer to the nearest hundredth.

\newline

_____ square millimeters

Identify formula: Step $1$ : Identify the formula to calculate the area of a circle, which is $A = \pi r^2$ , where $r$ is the radius of the circle. Since the diameter is given as $6\,\text{mm}$ , the radius is half of the diameter.
Substitute radius: Step $2$ : Substitute the radius into the area formula to find the area of the pupil. Use $3.14$ for $\pi$ .

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