Answer:
the area of the circle is pi*(5 units)^2 = 25*pi units^2
Step-by-step explanation:
The formula for the circumference of a circle is C = 2*pi*r, where r is the radius. Then the formula for the radius, r, is r = C/(2*pi).
Here the circumference is C = 31.4 units, so the radius is
31.4 units
r = -------------------
6.28
or r = 5 units.
The area of the same circle is A = pi*r^2.
Here, with r = 5 units, the area of the circle is pi*(5 units)^2 = 25*pi units^2.
78.5 unit^2
_____________________
A=pir^2
A= pi*5^2
A=25 pi
A= 78. Unit^2
