Answer Posted / s.kumar

Volume of Trapezoidal footing= h/2(a+b)*l
where,
h= depth of footing
a= top width of footing
b= bottom with of footing
l= length of footing
In Case of Frustrum of Pyramid
V= h/3(A1+A2+Square root of A1*A2)
Where,
A1= Area of top section (a*b)
A2= Area of Bottom Section (A*B)

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