# Reach for the Summit - M-S7-A1

Geometry Level pending

If point $A,B,C,D$ are in the $3D$ space, $\angle ABC = \angle BCD = \angle CDA = \angle DAB = 90 \degree$, is it always true that $A,B,C,D$ are on the same plane?

Reach for the Summit problem set - Mathematics

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