Respuesta :

first step is to find the area of the triangle on the end:

area of a triangle =  1/2 x base x height:

base = 4m and height  = 2m

area =  1/2 x 4 x 2 = 4 square meters

now for volume multiply the are of the triangle by the depth which is 5m

volume = 4 x 5 = 20 cubic meters
 the answer is D

v=1/2 a(length) b(base) h(height)
V = 1/2 (5m)(4m)(2m)=20 m^3, so d is correct.
Hope Helps:)