Formulas: Plane Geometry

Polygons: Number of Diagonal

Polygons: Interior Angle

Polygons: Area of n-side polygon @ side b

Polygons: Area of n-side polygon @ inscribed in a circle

Polygons: Area of n-side polygon @ circumscribed in a circle

Circle: Arc Length

Circle: Sector Area

Circle: Segment Area

Circle Theorems: Inscribed angle or Tangent & Chord

Circle Theorems: Intersecting Chords

Circle Theorems: Intersecting Secants

Circle Theorems: Tanget and Secant

Triangles: Area

Triangles: Inscribed in a circle

Triangles: Circumscribes a circle

Triangles: Circle tangent to side A

Parallelogram: Area

Parallelogram: Rhombus Area

Trapezoid: Area

Trapezium: Area

Cyclic Quadrilateral: Bramaguptha's Formula

Cyclic Quadrilateral: Ptolemy's Theorem

Ellipse: Area

Ellipse: Perimeter or Circumference

Parabolic Segment: Area

Plane Area