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

Approx 2 minutes

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