First to answer correctly gets brainliest
Clicking on the images makes it full

Answer:
a)
There are 6 planes - 5 faces of the pyramid and one base, which overlaps with the plane X.
b)
Collinear points are the points on the same line:
c)
The intersection of planes X and HGD is the line section HG.
a:-
This is a pentagonal pyramid
B:-
C:-
HG is the intersection line