Triangle can be defined as three sided closed figure or we can say triangle is a three sided Polygon. There are different types of Triangles like Equilateral Triangle, isosceles triangle and Scalene Triangle.
An equilateral triangle is a triangle which has all sides of equal length and all angles are of also equal measure. Isosceles triangle is a triangle in which two sides are of equal length and two angles are of equal measure. Scalene triangle is a triangle which has all sides of different length and all angles are of different measure. Now we will see how many angles does a triangle have.
As we know that a triangle has 3 sides and 3 vertices and each vertex has one angle in them and therefore there are total of 3 angles in a triangle.
The sum of angles of a triangle is equals to 180 0. Suppose we have a triangle ABC with three angles A, B and C at each vertex respectively then sum of these three angles will be equals to 180 0,
Angle A + Angle B + Angle C = 180.
We can find the measure of third angle if measure of other to angles is known.
Like if angle A = 40 0, angle B = 600 then we can find third angle C as shown below:
A + B + C = 180,
=> C = 180 – A – B
=> C= 180 – 40 – 60
=> C = 80
Therefore angle C is equals to 800.
So From above discussion we can say that there are total of three angles in a triangle, whose sum is equals to 1800.