Answer :
Mario's:
8 * 14.13 = 113.04
A = pi * r^2
Plug in what we know:
113.04 = 3.14 * r^2
Divide 3.14 to both sides:
36 = r^2
Find the square root of both sides:
r = 6
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 6
Multiply:
C = 37.68
Tito's:
16 * 12.56 = 200.96
A = pi * r^2
Plug in what we know:
200.96 = 3.14 * r^2
Divide 3.14 to both sides:
64 = r^2
Find the square root of both sides:
r = 8
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 8
Multiply:
C = 50.24
Peter's:
10 * 15.386 = 153.86
A = pi * r^2
Plug in what we know:
153.86 = 3.14 * r^2
Divide 3.14 to both sides:
49 = r^2
Find the square root of both sides:
r = 7
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 7
Multiply:
C = 43.96
So the correct order is:
Mario's, Peter's, Tito's
8 * 14.13 = 113.04
A = pi * r^2
Plug in what we know:
113.04 = 3.14 * r^2
Divide 3.14 to both sides:
36 = r^2
Find the square root of both sides:
r = 6
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 6
Multiply:
C = 37.68
Tito's:
16 * 12.56 = 200.96
A = pi * r^2
Plug in what we know:
200.96 = 3.14 * r^2
Divide 3.14 to both sides:
64 = r^2
Find the square root of both sides:
r = 8
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 8
Multiply:
C = 50.24
Peter's:
10 * 15.386 = 153.86
A = pi * r^2
Plug in what we know:
153.86 = 3.14 * r^2
Divide 3.14 to both sides:
49 = r^2
Find the square root of both sides:
r = 7
Plug this into the formula for the Circumference of a Circle:
C = 2 * pi * r
C = 2 * 3.14 * 7
Multiply:
C = 43.96
So the correct order is:
Mario's, Peter's, Tito's