Right Triangle Side and Angle Calculator

Your details

Choose which two values you already know. The calculator solves for everything else.
One of the two shorter sides (legs) of the right triangle.
The other shorter side (leg) of the right triangle.
Leg a
3

Length of leg a

Leg b4
Hypotenuse c5
Angle A36.8699deg
Angle B53.1301deg
Altitude h2.4
Area6sq units
Perimeter12units

Triangle solved: legs 3.0000 and 4.0000, hypotenuse 5.0000.

  • The side ratio 3:4:5 is a Pythagorean triple, a set of integers that satisfy a^2 + b^2 = c^2 exactly.
  • Angle A is 36.87 deg and angle B is 53.13 deg. They always add to 90 deg in a right triangle.
  • Area = (3.0000 x 4.0000) / 2 = 6.0000 square units.
  • The altitude from the right angle to the hypotenuse is 2.4000 units, which also equals a*b/c.

Next stepTo scale the triangle, multiply all sides by a constant. The angles stay the same, and area scales by the square of that constant.

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