Question 976092
HI there,
Divide the prism into parts of surface area:
A base = 6 x 18 = 108 ins^2
2 sides = 2(3 x 18) = 108 ins^2
2 triangular ends = 2( 1/2 (6x20))=120 ins^2
Total:
108 + 108 + 120 = 336 ins^2
Hope this helps:-)