The general equation of a line is:

When m is the gradient and x1 and y1 are the coordinates of the points on the line
Therefore:


Figure A. is going to be 60 square feet and Figure B. is going to be 67.
Vsphere=(4/3)pir³
d/2=r
given
d=4
d/2=r=4/2=2
Vsphere=(4/3)pi2³
Vsphere=(4/3)pi8
Vsphere=32/3pi
using pi=3.14
Vsphere=33.493333333333 cm³
round
Vsphere=33 cm³