Question: Consider the plane ax + by + cz = d, where a, b, c, and d are all positive. Use Problem 15 to show that

Consider the plane ax + by + cz = d, where a, b, c, and d are all positive. Use Problem 15 to show that the volume of the tetrahedron cut from the first octant by this plane is d D / (3 (a2 + b2 + c2), where D is the area of that part of the plane in the first octant?

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