Area of an Oblique Triangle Calculator

Your details

Pick the method that matches the values you already know.
Length of the first side adjacent to the known angle.
units
Length of the second side adjacent to the known angle.
units
The angle between sides a and b, in degrees.
deg
Area
30.3109square units

Area of the oblique triangle

Perimeter25.8882units
Semi-perimeter12.9441units
Area30.3109
Perimeter25.8882

Area = 30.3109 square units

  • The area is 30.3109 square units, calculated using the SAS (two sides and included angle).
  • The perimeter of this triangle is 25.8882 units and the semi-perimeter is 12.9441 units.
  • The included angle is acute, so this triangle is an acute oblique triangle.
  • Oblique triangles have no right angle: the four area formulas shown here cover every combination of sides and angles you might know.

Next stepTo verify the result, try entering the same triangle using a different method - all valid approaches must give the same area.

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