Geometry · Technical Drawing
Triangle Perimeter Calculator
Enter three side lengths for a scaled drawing with perimeter, area, and angles.
aSide A (BC)
units
bSide B (CA)
units
cSide C (AB)
units
Side A is opposite vertex A (the edge between B and C), and so on. Enter any consistent unit — cm, in, m — the drawing scales to fit either way.
Perimeter
0.00
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Area0.00
Angles (A · B · C)— · — · —
By Sides—
By Angles—
Full Log
Perimeter = a + b + c. Area uses Heron's formula: with s as the semi-perimeter, Area = √(s(s−a)(s−b)(s−c)). Angles are found via the Law of Cosines. Classification checks side equality (equilateral / isosceles / scalene) and the largest angle (right / acute / obtuse).