[" 2) prove that the sum of the angles of a triangle "],[" is "180^(@).]

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

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

Sum of angles of a triangle

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

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

The sum of the angles of a triangle is two right angles or 180^(@).

Theorem 6.7 : The sum of the angles of a triangle is 180º

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.