Hello Jampop1.So is the point .

Find the coordinates of in a similar way.

2. The plane passes through the origin, so its equation is of the form:We may divide through by , to obtain an equation of the form:

The point lies in the plane. So:Similarly for . Solve for and .

3. Use the triple scalar product to find the volume of the parallelopiped:Volumewhich is most easily calculated using the 3 x 3 determinant form. For reference see here.

Grandad