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

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

The sum of all exterior angles of a triangle is

In a convex hexagon,prove that the sum of all interior angle is equal to twice the sum of its exterior angles formed by producing the sides in the same order.

27.Prove that an exterior angle of a triangle is equal to the sum of its interior opposite angles.

The side BC of a ABC is produced on both sides.Show that the sum of the exterior angles so formed is greater than /_A by two right angles.

The side BC of a ABC is produced on both sides.Show that the sum of the exterior angles so formed is greater than /_A by two right angles.

Which of the following statements are true (T) and which are false (F): Sum of the three angles of a triangle is 180^0 A triangle can have two right angles. All the angles of a triangle can be less than 60^0 All the angles of a triangle can be greater than 60^0 All the angles of a triangle can be equal to 60^0 A triangle can have two obtuse angles. A triangle can have at most one obtuse angles. In one angle of a triangle is obtuse, then it cannot be a right angled triangle. An exterior angle of a triangle is less than either of its interior opposite angles. An exterior angle of a triangle is equal to the sum of the two interior opposite angles. An exterior angle of a triangle is greater than the opposite interior angles

If the exterior angle of a quadrilateral formed by producing one of its sides is equal to the interior opposite angle, prove that the quadrilateral is cyclic.