Answer:
a) Point U is not coplanar with points R, S, and T because it does not lie in the same plane as these points.
b) The coplanarity of point W with points Q and R depends on their spatial arrangement. If points Q, R, and W all lie in the same plane, then point W is coplanar with points Q and R. However, if point W is not in the same plane as points Q and R, then it is not coplanar with them.
To determine whether point W is coplanar with points Q and R, you would need to know the specific spatial coordinates or arrangement of these points. Without that information, it's not possible to definitively say whether point W is coplanar with points Q and R. So, the answer would depend on the given spatial arrangement of these points.
Explanation: