A Conjecture is only an educated guess which might or might not be true. When two angles are supplementary, it means their sum when added together is 180°. But as per this, conjecture both the angles are acute, which means both are less than 90°. This is not possible.
This can be explained with a counter example. It is an example that can be given to show that a particular conditional statement is false.
If both angles are acute means they are less than 90°.Like one angle is 80° and the other is 70°. Adding 80° and 70° we will get 150°, which is not supplementary.
