Circle circumference = 4

Circle circumference = 4

A circle has circumference = 4

Calculate Area, Circumference, Radius, Diameter

Calculate radius (r):

C = 2πr

Rearranging the equation, we get:

r  =	C
	2π

r  =	4
	2 * 3.1415926535898

r  =	4
	6.2831853071796

r = 0.63661977236758

Calculate diameter (d):

d = 2r

d = 2 * 0.63661977236758

d = 1.2732395447352

Calculate Area (A):

A = πr2

A = π * 0.636619772367582

A = 0.4053π or 1.2733

Final Answers

r = 0.63661977236758
d = 1.2732395447352
A = 0.4053π or 1.2733

You have 1 free calculations remaining

What is the Answer?

r = 0.63661977236758
d = 1.2732395447352
A = 0.4053π or 1.2733

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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