Respuesta :

Abu99
Volume = Cross-sectional area * length
C-S area = 1/2 * b * h
1/2(4)(15) = 30
length = 18
Volume = 30 * 18
= 540 mm^3

S' area = 2(C-S area) + 8(18) + 15(18) + 17 (18)
= 2(30) + 8(18) + 15(18) + 17(18)
= 60 + 144 + 270 + 306
= 780 mm^2