Triangle Area Calculator
Triangle Area Calculator with Steps S = ah/2
Pick the data your problem gives. The solution checks the conditions, states the formula, then substitutes step by step.
The calculator above finds the area of a triangle from the base and height, from three sides with Heron's formula, or from two sides and the included angle.
Formulas used
S = ½ · a · hₐ
Heron: S = √(p(p − a)(p − b)(p − c))
S = ½ · ab · sin C
- The three sides must satisfy the triangle inequality.
Worked example
Sides 3, 4, 5 (p = 6):
S = √36 = 6
Enter the same values in the calculator above to see every step of the solution.
How to use the calculator
- Choose the method and enter the known measurements.
- Press the calculate button. The result appears instantly.
- Read the step-by-step solution, rendered with KaTeX, to check your own work.