A circle has circumference = 18
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
C = 2πr
Rearranging the equation, we get:
| r = | C |
| 2π |
| r = | 18 |
| 2 * 3.1415926535898 |
| r = | 18 |
| 6.2831853071796 |
r = 2.8647889756541
Calculate diameter (d):
d = 2r
d = 2 * 2.8647889756541
d = 5.7295779513082
Calculate Area (A):
A = πr2
A = π * 2.86478897565412
A = 8.207π or 25.7831
Final Answers
r = 2.8647889756541
d = 5.7295779513082
A = 8.207π or 25.7831
d = 5.7295779513082
A = 8.207π or 25.7831
Common Core State Standards In This Lesson
7.G.B.4
What is the Answer?
r = 2.8647889756541
d = 5.7295779513082
A = 8.207π or 25.7831
d = 5.7295779513082
A = 8.207π or 25.7831
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.
This calculator has 1 input.
What 3 formulas are used for the Circles Calculator?
d=2r
A = 2πr2
C=2πr
A = 2πr2
C=2πr
What 7 concepts are covered in the Circles Calculator?
- area
- Number of square units covering the shape
- circle
- the set of all points in the plane that are a fixed distance from a fixed point
- circles
- circumference
- the perimeter of a circle or ellips
- diameter
- distance from two endpoints of a circle through the center
d = 2r - origin
- On a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross.
- radius
- Distance from the center of a circle to the edge
C/2π
