" 13.Prove that sum of three angles of a triangle is "180^(@)

The sum of the three angles of a triangle is 180^(@)

Prove that the sum of the three angles of a triangle is 180^(@).

Prove that the sum of the three angles of a triangle is 180^0dot

Sum of the three angles of a triangle is 180^@ .

In an isosceles triangle, the base angles are equal.The vertex angle is 40^@ .What are the base angles of the triangles? (Remember the sum of three angles of a triangle is 180^@ )

Solve the following: In an isosceles triangle, the base angles are equal. The vertex angle is 40^@ . What are the base angles of the triangle? (Remember, the sum of three angles of a triangle is 180^@ ).

We know that the sum of the interior angles of a triangle is 180^(@). Show that the sums of the interior angles of polygons with 3,4,5,6 sides form an arithmetic progression.Find the sum of the interior angles of a 21 sided polygon.