Surface area of a Triangular Prism = 2(1/2*bh) + ah + bh + ch
So, 2(1/2*15*8) + 18*15 + 18*8 + 18*17
= (15*8) + 270 + 144 + 306
= 120 + 720
= 840 mm²
Volume of a Triangular Prism = 1/2*ab * h
v = 1/2 * 15 * 8 * 18
v = 60 * 18
v = 1080 mm³
Hope this helps!