Circle area = 4

Circle area = 4

A circle has area = 4

Calculate Area, Circumference, Radius, Diameter

Calculate radius (r):

A = πr2

Rearranging the equation, we get:

r2  =	A
	π

r  =	√A
	√π

r  =	√4
	√3.1415926535898

r  =	2
	1.7724538509055

r = 1.1283791670955

Calculate circumference (C):

C = 2πr

C = 2π * 1.1283791670955

C = 2.2568π or 7.0898

Calculate diameter (d):

d = 2r

d = 2 * 1.1283791670955

d = 2.256758334191

Final Answers

r = 1.1283791670955
C = 2.2568π or 7.0898
d = 2.256758334191

You have 1 free calculations remaining

What is the Answer?

r = 1.1283791670955
C = 2.2568π or 7.0898
d = 2.256758334191

How does the Circles Calculator work?

Free Circles Calculator - Calculates and solves for Radius, Diameter, Circumference, and Area of a Circle.
This calculator has 1 input.

What 3 formulas are used for the Circles Calculator?

What 7 concepts are covered in the Circles Calculator?

areaNumber of square units covering the shapecirclethe set of all points in the plane that are a fixed distance from a fixed pointcirclescircumferencethe perimeter of a circle or ellipsdiameterdistance from two endpoints of a circle through the center
d = 2roriginOn a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross.radiusDistance from the center of a circle to the edge
C/2π

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