If `OABC` is a tetrahedron such that `OA^2 + BC^2 = OB^2 + CA^2 = OC^2 + AB^2` then

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Q 1217801789.     If `OABC` is a tetrahedron such that `OA^2 + BC^2 = OB^2 + CA^2 = OC^2 + AB^2` then

(This question may have multiple correct answers)

A `OA` is perpendicular to `BC`
B `OB` is perpendicular to `CA`
C `AB` is perpendicular to `BC`
D `OC` is perpendicular to `AB`

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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