Answer:
180 cm³
Explanation:
split the side (the side facing us) into three rectangles. one rectangle immediately beneath top step, next under middles step and so on.
area under top step = (2 + 2 + 2) X 3 = 18.
area under middle step = (2 + 2) X 3 = 12
area under bottom step = 2 X 3 = 6
total area of this side (cross-section) = 18 + 12 + 6 = 36.
volume = 36 X length
= 36 X 5
= 180 cm³