Prove the following indirectly using paragraph form:

Question

If angle CAB is not right then, ray AB is not perpendicular to ray AC.

Answer 1

If ray AB was perpendicular to ray AC, then angle CAB would be a right angle.

Since angle CAB is not a right angle, then ray AB is not perpendicular to ray AC.

Answer 2

IF CAB is not a right angle, then it is not 90 degrees. All right angles are 90 degrees (or pi/2 radians)

To be perpendicular, AB must form a 90 degree angle with CA

IF it's not 90 degrees then AB is not perpendicular to CA