Answer
Proving The Picture as
a)
p is the vertex of P such that the angle ∠abp is smallest.
b)
p is the vertex of P with the least x-coordinate (other
than b).
c)
p is the vertex of P that is closest to b.
Work Step by Step
a)
In the left figure ∠abp is smallest, but bp is not an interior diagonal.
b) In the right figure bd is not an interior diagonal.
c) In the right figure bd is not an interior diagonal
