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Circle Calculator


Radius (r):
Area :
Perimeter :
   
    Fill in any item and get the results of other two by click the 'Calculate' button.


Segment of Circle Calculator


Radius (r):
Arc Angle (a):
   
Arc Area :
Arc Perimeter :
Chord Length :

Circle (Segment) Formulas

1. Area = π * r2

2. Perimeter = 2 * π * r

3. Area of shaded part = r2 * (a - sin(a)) / 2

4. Perimeter of shaded part = r * a

     ( Note: unit of arc angle is radian )


Circle Inscribed in a Triangle


Side a:
Side b:
Side c:
   
Inscribed Circle Radius :
Inscribed Circle Area :
Inscribed Circle Perimeter :

Radius of Circle Inscribed in a Triangle

1. Radius (r) = √s(s-a)(s-b)(s-c) / s

2. s = (a + b + c) / 2


Circle Circumscribing a Triangle


Side a:
Side b:
Side c:
   
Inscribed Circle Radius :
Inscribed Circle Area :
Inscribed Circle Perimeter :

Radius of Circle Circumscribing a Triangle

1. Radius (r) = abc / 4√s(s-a)(s-b)(s-c)

2. s = (a + b + c) / 2