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Triangle Calculator

Triangle Parameters

units
units
units

Results

Area
6.00
square units
Perimeter
12.00
units
Type
Right
Triangle
Height
2.40
units

Triangle Visualization

a=5 b=4 c=3 A=36.87° B=53.13° C=90°

Triangle Formulas

Area (Heron's Formula)
s = (a + b + c) / 2
Area = √[s(s-a)(s-b)(s-c)]
Right Triangle Area
Area = (a × b) / 2
Perimeter
P = a + b + c
Pythagorean Theorem
a² + b² = c²

Triangle Information

About Triangles

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.

Triangle Types by Sides

Equilateral: all sides equal. Isosceles: two sides equal. Scalene: all sides different.

Triangle Types by Angles

Acute: all angles < 90°. Right: one angle = 90°. Obtuse: one angle > 90°.

Triangle Properties

The sum of angles in any triangle is always 180°. The longest side is opposite the largest angle.