Free · Math · Geometry

Triangle Calculator

Solve a triangle from three side lengths, including area, perimeter, angles, and classification.

  • Checked formula
  • Private in your browser
  • No signup
Calculator inputs

Enter your values

Result

Your calculation

Area
6
square units
Perimeter
12
Angles
36.8699°, 53.1301°, 90°
Type
Right scalene

How to use this calculator

  1. Enter the known values using the units shown.
  2. Choose the calculation you want when more than one method is available.
  3. Calculate, then review the result and the worked formula together.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.