Answer Posted / prashant verma

if A is length and B is breath and H is total height of trapezoidal footing and a' and b' is size of column n h is trapezoidal portion height.
then total qty of concrete is=A*B*(H-h)+[{h/3{a^2+b^2+(ab)^1/2}]
where a=A*B
b=a'*b'

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