Circle Calculator

Radius (r):
Area :
Perimeter :


Segment of Circle Calculator

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




• Area = π * r2
• Perimeter = 2 * π * r
• Perimeter of shaded part = r * a
• Area of shaded part = r2 * (a - sin(a)) / 2


Circle Inscribed in a Triangle

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



• s = (a + b + c) / 2
• Radius (r) = √s(s-a)(s-b)(s-c) / s

Circle Circumscribing a Triangle

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





• s = (a + b + c) / 2
• Radius (r) = abc / 4√s(s-a)(s-b)(s-c)
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