Elementary Geometry

Basic Geometry Formulas Logo


  • Sides of a rectangle: \(a\), \(b\)
    Diagonal of a rectangle: \(d\)
    Radius of the circumscribed circle: \(R\)
    Perimeter of a rectangle: \(P\)
    Area of a rectangle: \(S\)
    1. A rectangle is a quadrilateral in which all four angles are right angles (equal to \(90^\circ\)).
    2. Rectangle
    3. Diagonal of a rectangle
      \(d = \sqrt {{a^2} + {b^2}} \)
    4. Radius of the circumscribed circle
      \(R = d/2\)
    5. Perimeter of a rectangle
      \(P = 2\left( {a + b} \right)\)
    6. Area of a rectangle
      \(S = ab\)