Question

Using the illustration below, calculate the area of the circle.



380 ft2

84 ft2

30.25 ft2

95 ft2

Answer 1

do you know the formula to find the area of a circle? :)

Answer 2

A = pi * r^2

Answer 3

yepp :)
So can you see in our diagram that they give you the diameter?
The picture shows that the diameter = 11ft (Note: diameter = 2 * radius)
And we want to find the RADIUS. So we have to divide 11ft by 2 :)
Then you can plug your radius into the area of a circle formula :D

Answer 4

11/2 = 5.5

Answer 5

11 = 2 * 5.5 ?

Answer 6

hmm.. your first step was correct!
Diameter = 11
So radius (r) = 11/2 = 5.5 ft
Then you use the area of the circle formula : pi*r^2

Answer 7

what will be the pi?

Answer 8

do you know how to use pi on your calculator?
you can also use pi = 3.14

Answer 9

oh so it would be 3.14 * 5.5^2 ?

Answer 10

yess ! :)

Answer 11

3.14 * 30.25 = 94.985

Answer 12

yep! :) Now if you round it to a whole number, you would get 95 ft ^2

Answer 13

ok thanks so much

Answer 14

you're welcome :)

Answer 15

Use A= pi D^2/4