Area and Perimeter of a Triangle

  • The sum of angles in a triangle is 180°.
  • The height is the perpendicular distance from a point to the opposite side.
  • The centre of a circumscribed circle is located at the intersection of the axes of the edges.
  • The axis of an edge is a perpendicular to the centre of the edge.
  • The centre of an inscribed circle is located at the intersection of the axes of the angles.
  • The axis of an angle divides the angle into two equal halves.
  • A median is the point connecting line with the centre of the opposite side.
  • Medians intersect at the centre that divides their length in a 2:1 ratio.

Formulas

Triangle Area and Perimeter of a Triangle
  • P – perimeter
  • A – area
  • a,b,c – edges
  • ha – height to edge a

Calculator

Enter 3 values

a =
b =
c =
α =
β =
γ =

Round to decimal places

Area A =
Perimeter P =

Calculation Procedure

latex

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