x+3
4+(x+2)
4
or
x+3 * 1
x+6 4
x+3
4x+24
Area = pi*r^2
Circumference = 2pi*r
Step 1: find the radius from area
81pi=pi*r^2
81=r^2
9=r
Step 2: plug in radius to the circumference equation
Circumference = 2pi*r
18pi is the answer, otherwise know as 56.52 as well.
Coefficients are the numbers in from with the variable, the constant is just a number and the degree is the exponent.