Geometry

Triangle Area & Perimeter

Area uses the base and the perpendicular height — the straight-line distance from the base to the opposite corner. Perimeter uses the three side lengths, and the tool checks that those sides can actually form a triangle.

InputsA = ½bh

What do you want to find?Base (area only)Perpendicular height (area only)Side a (perimeter only)Side b (perimeter only)Side c (perimeter only)Unit

Step-by-step

waiting

Fill in the fields and press Solve. The full method will appear here, one numbered step at a time.

4 tools in Geometry.Back to the tool directory →

Related formulas

Explained with worked examples in the Formula Library.

Area of a triangle Perimeter of a triangle and the triangle inequality