Integrand for a set of points

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I need help finding what I should be integrating when the question asks to find the double integral to find the volume of the tetrahedron given the points $(0,0,0),(3,0,0),(2,1,0),(3,0,4)$. Would the integrand be $1$? Would I somehow find the limits by finding equation of the lines between the points?

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Yes, the integral is $\int \int \int 1 \ dx \ dy \ dz$ You assess the limits so you cover the tetrahedron, based on the faces and edges