The area of a circle is 50.24 square millimeters. What is the circle's radius?
A = 50.24 mm2
Use 3.14 for u.
Remember that
the area is equal to
A=pi*(r^2)
we have
A=50.24 mm2
pi=3.14
substitute given values
50.24=3.14*(r^2)
solve for r
r^2=50.24/3.14
r^2=16
square root
r=4 mm
Part 2
we have
C=31.4 in
Remmeber that the circumference is equal to
C=2pir
we have
C=31.4
pi=3.14
substitute
31.4=2(3.14)r
solve for r
r=31.4/(2*3.14)
r=5 in