You always have to find the LSA (lateral surface area) first.
(which is the shape's area combined w/out the bases.)
rectangle A would be 60 and so would rectangle C
rectangle B would be 96
if u add them all together that would be 12.5
Now you have to find the TSA (total surface area).
(which is the TOTAL net combined w/ bases)
the bases would be 7.5
7.5 x 2 is 12.5
Add the LSA and the TSA
216+12.5=228.5
so the overall answer would be 228.5cm
i hope this helps!!
