9. Measurement
Middle Years
9.03 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
2min
A circle has a radius of $4$4 mm.
Easy
< 1min
A circle has a radius of $12$12 mm.
Easy
1min
A circle has a radius of $47$47 cm.
Easy
1min
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