A circle has area = 18
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
A = πr2
Rearranging the equation, we get:
| r2 = | A |
| π |
| r = | √A |
| √π |
| r = | √18 |
| √3.1415926535898 |
| r = | 4.2426406871193 |
| 1.7724538509055 |
r = 2.3936536824086
Calculate circumference (C):
C = 2πr
C = 2π * 2.3936536824086
C = 4.7873π or 15.0398
Calculate diameter (d):
d = 2r
d = 2 * 2.3936536824086
d = 4.7873073648172
Final Answers
r = 2.3936536824086
C = 4.7873π or 15.0398
d = 4.7873073648172
C = 4.7873π or 15.0398
d = 4.7873073648172
Common Core State Standards In This Lesson
7.G.B.4
What is the Answer?
r = 2.3936536824086
C = 4.7873π or 15.0398
d = 4.7873073648172
C = 4.7873π or 15.0398
d = 4.7873073648172
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
Example calculations for the Circles Calculator
- Circle radius = 2
- Circle diameter = 2
- Circle area = 2
- Circle circumference = 2
- Circle radius = 3
- Circle diameter = 3
- Circle area = 3
- Circle circumference = 3
- Circle radius = 4
- Circle diameter = 4
- Circle area = 4
- Circle circumference = 4
- Circle radius = 5
- Circle diameter = 5
- Circle area = 5
- Circle circumference = 5
- Circle radius = 6
- Circle diameter = 6
- Circle area = 6
- Circle circumference = 6
- Circle radius = 7
- Circle diameter = 7
- Circle area = 7
- Circle circumference = 7
- Circle radius = 8
- Circle diameter = 8
- Circle area = 8
- Circle circumference = 8
- Circle radius = 9
- Circle diameter = 9
- Circle area = 9
- Circle circumference = 9
- Circle radius = 10
- Circle diameter = 10
- Circle area = 10
- Circle circumference = 10
- Circle radius = 11
- Circle diameter = 11
- Circle area = 11
- Circle circumference = 11
- Circle radius = 12
- Circle diameter = 12
- Circle area = 12
- Circle circumference = 12
- Circle radius = 13
- Circle diameter = 13
- Circle area = 13
- Circle circumference = 13
- Circle radius = 14
- Circle diameter = 14
- Circle area = 14
- Circle circumference = 14
- Circle radius = 15
- Circle diameter = 15
- Circle area = 15
- Circle circumference = 15
- Circle radius = 16
- Circle diameter = 16
- Circle area = 16
- Circle circumference = 16
- Circle radius = 17
- Circle diameter = 17
- Circle area = 17
- Circle circumference = 17
- Circle radius = 18
- Circle diameter = 18
- Circle area = 18
- Circle circumference = 18
- Circle radius = 19
- Circle diameter = 19
- Circle area = 19
- Circle circumference = 19
- Circle radius = 20
- Circle diameter = 20
- Circle area = 20
- Circle circumference = 20
