Direct answer

What does the triangle calculator solve?

The triangle calculator solves area, perimeter, missing base or height, and right-triangle hypotenuse. It uses formulas such as $A = 1/2 bh$ , $P = a + b + c$ , and $a^{2} + b^{2} = c^{2}$ with step-by-step work. It keeps area units and side-length units separate.

Quick formula table

Calculator formulas

Calculator	Formula	What it finds
Triangle	$A = \frac{1}{2} \times b \times h$	Area
Triangle	$P = a + b + c$	Perimeter
Triangle	$a^{2} + b^{2} = c^{2}$	Right triangle hypotenuse

Calculator

Triangle Calculator

Results include the answer, unit, formula, and calculation steps.

Formula reference

Related formula pages

FAQ

Triangle Calculator FAQ

What inputs do I need for triangle area?

You need the base and the perpendicular height.

What inputs do I need for triangle perimeter?

You need all three side lengths.

Can it check a right triangle?

Yes. Enter side a and side b to calculate the hypotenuse using the Pythagorean theorem.