Circle diameter = 4 
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
A circle has diameter = 4
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
| r = | d |
| 2 |
| r = | 4 |
| 2 |
r = 2
Calculate circumference (C):
C = 2πr
C = 2π * 2
C = 4π or 12.5664
Calculate Area (A):
A = πr2
A = π * 22
A = 4π or 12.5664
Final Answers
r = 2
C = 4π or 12.5664
A = 4π or 12.5664
You have 1 free calculations remaining
What is the Answer?
r = 2
C = 4π or 12.5664
A = 4π or 12.5664
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 centerd = 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
Example calculations for the Circles Calculator
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