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9.03 The area of a circle

Interactive practice questions

The formula for the area of a circle is
$A=\pi r^2$A=πr2
where $A$A is the area and $r$r is the radius.

Consider the circle below:

a

What is the exact area of the circle?

b

What is the area of the circle rounded to two decimal places?

Easy
Approx 2 minutes
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A circle has a radius of $4$4 mm.

A circle has a radius of $12$12 mm.

A circle has a radius of $47$47 cm.

Outcomes

MA4-13MG

uses formulas to calculate the areas of quadrilaterals and circles, and converts between units of area

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