About Triangle Formulas
For two-dimensional shapes, there are two basic measurements which we need to find out which are area and perimeter of a given shape. Hence, the triangle has two basic formulas which help us to determine area and perimeter.
Perimeter of Triangle
The perimeter of triangle is the sum of all three sides of the triangle. Get the List of all Maths formulas in one place.
Let a,b, and c respectively be sides of a triangle then
Perimeter of Triangle formula = a + b + c
Classification of Triangle
Triangles can be divided on basis of their side length and angle. Now take a look at table given below which shows the difference between 6 different types of triangles on basis of angles and sides.
| By Side | By Angle |
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The equilateral Triangle has three equal sides
Isosceles Triangle has two equal sides
Scalene Triangle has no equal sides
Acute Triangle has three angles? 90°
The right Triangle has one angle = 90°
Obtuse Triangle has one angle > 90°Area of Triangle
The area of a triangle is the space covered by the triangle. It is half multiplication of its base and altitude. It is given in square units. Observe triangle ABC given below which shows the base and height of a triangle which are used to evaluate the area of a triangle.
Area of triangle
Area of ΔABC = 1/2 x BC x AD
Here, BC is the base and AD is the height of the triangle.