krgua area with radius 400 equal to 502640
A circle (circle) is a geometric figure on a plane, all points of which are equidistant from a given point (the center of the circle).
Circle area formula 
where R is the radius of the circle
where d is the diameter of the circle
where L is the circumferenceSolution:
S =
πR2
=
3.1415·4002
=
502640
Answer: krgua area with radius 400 equal to 502640