Answer :

guessing you mean either surface area of volume
d/2=r
SA=2pir^2+2hpir
V=hpir^2

given
d=26 and h=12
d/2=r
26/2=13
r=13

SA=2pir^2+2hpir
SA=2pi13^2+2(12)pi13
SA=2pi169+24pi13
SA=338pi+312pi
SA=650pi cm^2

V=hpir^2
V=12pi13^2
V=12pi169
V=2028pi cm^3

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