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Side length of the regular polygon Calculates the side length of the regular polygon circumscribed or inscribed to a circle. Created by user's request |

Circle formulas Circle formulas |

Counting pipes from the end face The approach to the calculation of the number of nested circles of smaller radius at a known length of the describing circle of a larger radius. Created by user request |

Circumcircle of a triangle This online calculator determines the radius and area of the circumcircle of a triangle given the three sides |

Triangle Incircle Calculator: Radius, Area, and Ratio The Triangle Incircle Calculator is a tool that allows you to determine the properties of the incircle of a triangle based on its side lengths. By entering the lengths of the three sides, this calculator calculates the radius and area of the incircle, which is the largest circle that can fit inside the triangle. |

Regular Polygon Incircle and Circumcircle Calculator This page presents two online calculators: the Incircle of a regular polygon calculator and the circumcircle of a regular polygon calculator. |

Circular segment Here you can find the set of calculators related to circular segment: segment area calculator, arc length calculator, chord length calculator, height and perimeter of circular segment by radius and angle calculator. |

Regular polygon, number of sides and length of side from incircle and circumcircle radii This online calculator finds number of sides and length of side of regular polygon given the radii of incircle and circumcircle |

How many circles of radius r fit in a bigger circle of radius R This calculator estimates how many circles of radius r can be placed inside another circle of radius R. |

Circular segment - complete solution The calculator solves arc length, area, angle, height, chord or radius of circular segment by two given parameters. |

Find the intersection of two circles This online calculator finds the intersection points of two circles given the center point and radius of each circle. It also plots them on the graph. |

Equation of a circle calculator This circle equation calculator displays a standard form equation of a circle, a parametric form equation of a circle, and a general form equation of a circle given the center and radius of the circle. Formulas can be found below the calculator. |

Equation of a circle passing through 3 given points This online calculator finds a circle passing through three given points. It outputs the center and radius of a circle, circle equations and draws a circle on a graph. The method used to find a circle center and radius is described below the calculator. |

Arc length calculator This universal online calculator can find arc length of circular segment by radius and angle, by chord and height and by radius and height. |

Area-to-Radius Calculator This online calculator calculates the radius of a circle from the given area of a circle. |

Cutting a circle Two ways to cut a circle into equal parts : sector cuts and parallel cuts. |

General to Standard Form Circle Converter The calculator takes the equation of a circle in general form, with variables for x, y, and constants a, b, c, d and e, and converts it to the standard form equation for a circle with variables h, k, and r. It then calculates the center of the circle (h, k) and its radius r. If the equation cannot be converted to standard form, the calculator reports an error message. |