Given: Points are A(5, -4, 2), B(4, -3, 1), C(7, 6, 4) and D(8, -7, 5)

To find: name of the quadrilateral formed by these 4 points

Formula used:

The distance between any two points (a, b, c) and (m, n, o) is given by,

Therefore,

Distance between A(5, -4, 2) and B(4, -3, 1) is AB,

Distance between B(4, -3, 1) and C(7, 6, 4) is BC,

The distance between C(7, 6, 4) and D(8, -7, 5) is CD,

Distance between A(5, -4, 2) and D(8, -7, 5) is AD,

Clearly,

No two sides are equal

So, it cannot be square, rectangle or parallelogram.