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Heron's formula calculator This calculator calculates the area of a triangle using Heron's formula. This formula gives the area of a triangle from the lengths of all three sides. The formula can be found below the calculator. |

Median of a triangle This online calculator computes the median of a triangle given triangle sides |

Angle bisector of a triangle This online calculator computes the length of angle bisector given the lengths of triangle edges |

Altitude of a triangle This online calculator computes the altitude length of a triangle, given the lengths of sides of a triangle. |

Area of triangle by coordinates This calculator determines the area of a triangle using its vertex coordinates in the cartesian coordinate system. |

Triangle angles for given triangle sides This calculator computes triangle angles for given triangle sides using cosine law |

Pythagorean theorem calculator Calculates the side length of a right triangle from two other sides using Pythagorean theorem. Created by user's request |

Side length of a triangle This calculator computes side length of a triangle given two sides and angle between them (law of cosines) |

Lengths of triangle sides given one side and two angles This online calculator determines lengths of triangle sides given one side and two angles |

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

Incircle of a triangle This online calculator determines the radius and area of the incircle of a triangle given the three sides |

Polygon area An online calculator calculates a polygon area, given lengths of polygon sides and diagonals, which split polygon to non-overlapping triangles. |

Area of a triangle This is universal online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle. |

Equilateral triangle This online calculator calculates characteristics of the equilateral triangle: the length of the sides, the area, the perimeter, the radius of the circumscribed circle, the radius of the inscribed circle, the altitude (height) from single known value |

Center of mass of a triangle This online calculator finds the centroid, or barycenter (center of gravity) of a triangle by the coordinates of its vertices |

Triangle values by coordinates of vertices This online calculator calculates a set of triangle values: length of sides, angles, perimeter, and area by coordinates of its vertices |