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

If a side of the cyclic quadrlateral is produced ; then the external angle is equal to the interior opposite angles.

If one side of a cyclic quadrilateral is produced , then the external angle thus obtained is not equal to its internally oppsite angle.

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.

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.

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.

If one angle of a cyclic quadrilateral is 75^(@) , then the opposite angle is

one side of a triangle is produced and the exterior angle so formed is 120^(@) .if the interior opposite angles be in the ratio 3:5 .find the measure of each angles of triangle .