" Prove that the sum of the 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.

We know that the sum of the interior angles of a triangle is 180^0 . 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.

We know that the sum of the interior angles of a triangle is 180^0 . Show that the sums of eth interior angles of polygons with 3,4,5,6, sides for an arithmetic progression. Find the sum of the interior angles of or a 21 sided polygon.

State whether true or false Sum of the three exterior angles of a triangle is 180^(@)

Prove that the sum of the three exterior angles of a triangle,formed by producing the sides in order,is 4 right angles.

The sum of the degree measures of the three angles of a triangle is 180. The measure of the 2nd angle exceeds that of the 1st by 8 and the measure of the 3rd angle is twice of that of the 2nd. Find the measure of each angle.

Express the following statements by equations : The sum of the degree measures of the three angles of a triangle is 180^@ . The measure of the 2nd angle is twice that of the 1st and exceeds the thrid angle by 40^@ .