SOLUTION: HOW DO YOU SOLVE THE FOLLOWING PROBLEM? 1. IF RADIUS OF A CIRCLE IS 8.6CM WHAT IS THE AREA AND CIRCUMFRANCE?

Algebra ->  Graphs -> SOLUTION: HOW DO YOU SOLVE THE FOLLOWING PROBLEM? 1. IF RADIUS OF A CIRCLE IS 8.6CM WHAT IS THE AREA AND CIRCUMFRANCE?       Log On


   

Question 17070: HOW DO YOU SOLVE THE FOLLOWING PROBLEM?
1. IF RADIUS OF A CIRCLE IS 8.6CM WHAT IS THE AREA AND CIRCUMFRANCE?
Answer by tjnw79(57) About Me  (Show Source):
You can put this solution on YOUR website!
First of all you need to find the formulas for the circumference %28C%2Fd%29=pi and the area of a circle is r%5E2%2Api
C=circumfence
d=diameter 17.2=(8.6*2)
r=radius (8.6)
pi=3.14
So plug in your numbers first the area
8.6%5E2%2Api=232.3521927
now the circumfrence
%28C%2F17.2%29=3.14
multiply 17.2 on both sides of the = sign
17.2*(C/17.2)=(3.14*17.2)
C=54.03539364