The area of a circle is
A = pi*r^2 OR
A = pi*(D/2)^2 = (pi*D^2)/4
That's where the 4 comes from.
Note that the spelling of the Greek letter pi.
Find the total area of three circles, each with a radious of 1 1/2 feet.
Let ii stand for pie
Te book gives the answer as 27ii/4
aprroimately 21.195
I know the equation and can calculate the 27.
A=ii (1)^2
A=ii (1.5)^2=3
3 X 3 circles =27ii
I am not clear where the 4 is coming from and why it would be 27ii/4?
3 answers
I don't think I am understanding correctly?
Was I also suppose be using d=2r?
Was I also suppose be using d=2r?
the radius, is 1.5 ft = 3/2 ft
then the radius squared is 9/4
then
pi r^2 = pi (9/4)
then three of those is pi (27/4)
then the radius squared is 9/4
then
pi r^2 = pi (9/4)
then three of those is pi (27/4)