Question

Please help any one this is hard for me Thank you

Answer 1

So the formula I use is S = L + 2B
Surface Area = Lateral Area + 2(Base)
In this case, it would be 
Surface Area = Lateral Area + Base, since there is only one base
L= Perimeter(height)
L= 4(3 times 5)
     ----------------
             2
L= 4(15)
     ------
        2
L =60/2
L=30
S= 30 + B
B = 3 times 3 = 9
S= 39