Question

Which is the closest approximation to the area of the circle? Use 3.14 or 22/7 to approximate π.

Answer 1

For a circle, A=
`\pi`
`r^(2)`
For this circle the radius is 18mm so when we plug it in we get A=
`\pi (18)^(2)`

`18^(2) = 324` so now we have A=324
`\pi`
Using 3.14 as
`\pi` We now have A=(3.14)(324) which is equal to 1017.36
So we know that A=1017.36
`mm^(2)`

Answer 2

area=pi times r^2

radius=18mm
pemdas
exponents first
18^2=324
pi aprox=3.14
324 times 3.14=1017.36 mm^2 or square mm