IXL | Circles: word problems

After stepping into a room with unusual lighting, Dalton's pupil has a radius of 2 millimeters. What is the pupil's area?

If necessary, round your answer to the nearest hundredth.

square millimeters

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Learn with an example

question

A merry-go-round has a circular platform with a radius of 1 meter. What is the platform's area?

If necessary, round your answer to the nearest hundredth.

square meters

key idea

Use this formula to find the area from the radius.

A = 𝜋 × r²

Use 3.14 as an approximation for 𝜋.

𝜋 ≈ 3.14

solution

The radius is 1 meter. Replace r by 1 in the formula.

A	=	𝜋 × r²

	≈	3.14 × 1²

	≈	3.14 × 1 × 1

	≈	3.14

The area is about 3.14 square meters.

Looking for more? Try these:

Lesson: Area of circles

Lesson: Circumference of circles

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Work it out

Not feeling ready yet? These can help:

V.4Area and circumference of circles

Lesson: Area of circles

Lesson: Circumference of circles

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