1.

For any four points P,Q,R,S,|−−→PQ×−−→RS−−−→QR×−→PS+−−→RP×−−→QS| is equal to 4 times the area of the triangle

Answer»

For any four points P,Q,R,S,

|PQ×RSQR×PS+RP×QS| is equal to 4 times the area of the triangle



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