Area and Perimeter of a Right-angled Triangle

  • A right-angled triangle is formed by perpendicular legs and a hypotenuse — the longest edge.
  • The sum of angles in the triangle is 180°, with α + β = 90°.
  • Edge lengths can be determined using the Pythagoras theorem, angle sizes using the trigonometric functions.


Right-angled triangle Area and Perimeter of a Right-angled Triangle
  • P – perimeter
  • A – area
  • a,b – right-angled legs
  • c – hypotenuse


Enter 2 values

a =
b =
c =
α =
β =

Round to decimal places

Area A =
Perimeter P =

Calculation Procedure


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