Circle Diameter = 18
Publish date: 2024-06-12
Circle Diameter = 18 
A circle has Diameter = 18
Calculate Area, Circumference, Radius
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
| r = | d |
| 2 |
| r = | 18 |
| 2 |
r = 9
Calculate circumference (C):
C = 2πr
C = 2π * 9
C = 18π or 56.5487
Calculate Area (A):
A = πr2
A = π * 92
A = 81π or 254.469
Final Answers
r = 9
C = 18π or 56.5487
A = 81π or 254.469
You have 1 free calculations remaining
What is the Answer?
r = 9
C = 18π or 56.5487
A = 81π or 254.469
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
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