SOLUTION: Find the radius of a circle that has an area of 78.75 cm2 (squared). Use 3.14 for pi. Round to the nearest tenth.

Algebra ->  Finance -> SOLUTION: Find the radius of a circle that has an area of 78.75 cm2 (squared). Use 3.14 for pi. Round to the nearest tenth.      Log On


   

Question 1086173: Find the radius of a circle that has an area of 78.75 cm2 (squared). Use 3.14 for pi. Round to the nearest tenth.
Found 2 solutions by jim_thompson5910, MathLover1:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Area of circle = pi*(radius)^2
A = 3.14*(r)^2
78.75 = 3.14*(r)^2
78.75/3.14 = [3.14*(r)^2]/3.14
25.079617834395 = r^2
r^2 = 25.079617834395
sqrt(r^2) = sqrt(25.079617834395)
r = 5.00795545451384
r = 5.0 centimeters

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

the radius of a circle that has an area of 78.75cm%5E2
use formula for area of a circle:
A=r%5E2%2Api
r%5E2=A%2Fpi
r=sqrt%28A%2Fpi%29.........substitute area and pi
r=sqrt%2878.75cm%5E2%2F3.14%29
r=sqrt%2825.0796178343949cm%5E2%29
r=5.007955454513838cm
r=5.01cm to the nearest tenth will be
r=5.0cm