For (a):
Fig (i) shows pyramid whose base is pentagon.
AB,AC,AD,AE,AF,BC,CD,DE,BF and EF are sides of edges of pyramid.
∴ Number of edges of a pyramid whose base is a pentagon =10
For (b):
Fig (ii) shows pyramid whose base is hexagon
P,Q,R,S,T,U and V are vertices of hexagonal pyramid.
∴ Number of vertices of a pyramid whose base is hexagon =7.
For (c):
Radius of a cone (r)=3 units.
Height of a cone (h)=722 units.
Volume of a cone =πr2h3
=227×(3)2×722×3
=3 cu units.
For (d):
Number of edges of pyramid whose base and lateral faces are equilateral triangle =6
Total length of pyramid whose side is 2 units =6×2units=12units
So we get,
(a)→q
(b)→s
(c)→r
(d)→p