9. Measurement

Middle Years

The formula for the area of a circle is

$A=\pi r^2$`A`=π`r`2

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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