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Triangle Calculator
To find area & perimeter of triangle, input length (l), breadth (b), and click calculate button using triangle calculator
Table of Contents:
What is a 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 a triangle always add up to 180 degrees
- The exterior angles of a triangle always add up to 360 degrees
Formula
Area of a 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
Types of Triangle
There are seven types of triangles:
- Isosceles triangle
- Equilateral triangle
- Scalene triangle
- Right angle triangle
- Obtuse triangle
- Acute triangle
- Equiangular
How to calculate the area & perimeter of a triangle?
Example 1:
Calculate the area of a triangle with a given length of 3 and breadth of 4 cm.
Solution
length = l = 3
breadth = b = 4 cm
Take the formula and substitute the above values
Area = [l × b /2]
= (3*4/2) = 12/2 = 6
Example 2:
Calculate the Perimeter of a triangle with the given sides as 3, 4, and 5 cm.
Solution
a = 3 cm
b = 4 cm
c = 5 cm
Take the formula and substitute the above values
Perimeter = a + b + c
Perimeter = 3 + 4 + 5 = 12
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