knowing that the triangle area is equal to base by heigh between two, then:
The length of the longest altitude of your triangle is:
finally it can be seen that the position of the triangle does not matter, as long as the base and heigh are maintained, the area of the triangle will be the same
This would be true because it shows that p equals either a or b and it also shows that p equals a which is true because it is one of the independent choices.