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Core Geometry is a mathematical application which aims to solve geometrical problems quickly and reliably. Simply input the known values into the fields correlating to the 2D and 3D diagrams provided for each problem.



A parallelogram is a quadrilateral with two pairs of parallel sides. The opposite sides of a parallelogram are of equal length and the opposite angles are of equal measure.

  • Diagonal of a Rectangle
  • Diagonal of a Square
  • Surface Area of a Parallelogram
  • Surface Area of a Rectangle
  • Surface Area of a Square
  • Perimeter of a Parallelogram
  • Perimeter of a Square
  • Volume of a Cube


Any three points, when non-collinear, determine a unique triangle and a unique plane. A triangle has three sides and three angles. The three angles always add to 180°.

  • Surface Area of a Triangle
  • Surface Area - Heron's Formula
  • Perimeter of a Triangle


A circle is the set of all points in a plane that are at a given distance from a given point. It is the curve traced out by a point that moves so that its distance from a given point is constant.

  • Surface Area of a Circle
  • Area of a Sector of a Circle
  • Curved Surface Area of a Sphere
  • Perimeter of a Circle
  • Volume of a Sphere


A polygon is a plane 2D shape that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain. These segments are called its sides.

  • Surface Area (Apothem - Perimeter)
  • Surface Area (Apothem - Number of Sides)
  • Surface Area (Radius - Number of Sides)
  • Surface Area (Length of a Side - Number of Sides)
  • Perimeterof a Canonical Polygon


A convex quadrilateral with at least one pair of parallel sides is referred to as a trapezoid in American and Canadian English but as a trapezium in English outside North America.

  • Surface Area of a Trapezium
  • Perimeter of a Trapezium


A rhombus is a simple quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral, since equilateral means that all of its sides are equal in length.

  • Surface Area (Side - Height)
  • Surface Area (Diagonals)
  • Surface Area (Angle)
  • Perimeter of Rhombus


A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex.

  • Slant Height of a Cone
  • Total Surface Area (Radius - Height)
  • Total Surface Area (Radius - Slant Height)
  • Curved Surface Area (Radius - Slant Height)
  • Curved Surface Area (Radius - Height)
  • Volume of a Cone


A cylinder is one of the most basic curvilinear geometric shapes whose surface is formed by the points at a fixed distance from a given straight line, the axis of the cylinder.

  • Curved Surface Area of a Cylinder
  • Total Surface Area of a Cylinder
  • Volume of a Cylinder


An ellipse is a curve on a plane that surrounds two focal points such that the sum of the distances to the two focal points is constant for every point on the curve.

  • Surface Area of Ellipse
  • Perimeter of Ellipse
  • Volume of Ellipsoid

Analytical Geometry

Analytic geometry is the study of geometry using a coordinate system. It is frequently used in physics and engineering, and is the foundation of most modern fields of geometry.

  • Distance Between 2 points (x,y)
  • Distance Between 2 points (x,y,z)
  • Slope of a Line


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F. Tragopoulos

Developer & Programming Guide Author