A(-1; 0; 1); b(-1; 1; 0); c(1; 0; 0) and d(0; 1; 1) are the vertices of the pyramid. find the volume of this pyramid.

Since there are only 4 points, the pyramid is a triangular pyramid with volume of (1/2) x l x w x h
The length is 1, the width is 1, and the height is 1.
The volume is
(1/2) x 1 x 1 x 1
0.5 cubic units