Triangle Calculator

To find area & perimeter of triangle, input length (l), breadth (b), and click calculate button using triangle calculator

Table of Contents:

Formula

Formula

Area of triangle: [ l×b /2 ]
Perimeter of Triangle: [ (a + b + c) ]
Area of Equilateral Triangle: [ (Sqrt (3)/4)×(side)² ]
Area of Triangle SAS (2sides & opposite angle): [ ½×a×b×SinC ]

Where,
l = length
b =breadth
a,b, and c = sides of the triangle

A triangle is a plane figure with straight sides and three angles. All of the interior angles add up to 180 degrees. A triangle is a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted ABC.

A triangle is a three-sided polygon consisting of three line segments linked end-to-end.

The interior angles of triangle always add up to 180 degrees
The exterior angles of triangle always add up to 360 degrees

There are seven types of triangles:

Isosceles triangle
Equilateral triangle
Scalene triangle
Right angle triangle
Obtuse triangle
Acute triangle
Equiangular

Examples:

Calculate the area of a triangle with the given length as 3 and breadth as 4 cm.

Area = [ l×b /2 ]= (3*4/2) = 12/2 = 6

Calculate the Perimeter of triangle with the given sides as 3, 4 and 5 cm

Perimeter = a+b+c = 3+4+5 = 12

Calculate the area of an equilateral triangle with the given side length as 4 cm

Area = [ (Sqrt (3)/4)×(side)² ] = [ (sqrt(3)/4 *(4)2 ] = 1.73/4 *16 = 0.4325 *16 = 6.92

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