Exterior angle theorem : If a side of a triangle is produced; the exterior angle so formed is equal to the sum of the two interior opposite angles.

Theorem 6.8 : If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles.

THEOREM (Exterior Angle Property of a Triangle): If a side of a triangle is produced the exterior angle so formed is equal to the sum of two interior opposite angles.

An exterior angle of a triangle is equal to the sum of the two interior opposite angles.

The exterior angle of a triangle is equal to the sum of two

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

Exterior angle of a triangle is equal to sum of any two interior angles.

An exterior angle of a triangle is less than either of its interior opposite angles.

If one side of a cyclic quadrilateral is produced; then the exterior angle is equal to the interior opposite angle.