Answer:
2) slant height=15
surface area=[tex]864cm^{2}[/tex]
Step-by-step explanation:
[tex]half base ^{2}[/tex] x [tex]height^{2}[/tex]
[tex]9^{2} +12^{2}[/tex]
81+144
=225
[tex]\sqrt{225}[/tex]
=15
