if all the 3 sides of a triangle are produced, then the sum of 3 exterior angles so formed are = to _____________
If all the 3 sides of a triangle are produced, then the sum of 3 exterior angles so formed is equal to 360°.
If the sides of a triangle are produced in order, then the sum of the three exterior angles so formed is:
If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the ____ interior opposite angles.