12th Class
Mathematics
Sample Paper
Mathematics Olympiad - Sample Paper-4
question_answer
For any four points P, Q, R and \[S;\text{ }\!\!|\!\!\text{ }\overrightarrow{PQ}\times \overrightarrow{RS}-\] \[\overrightarrow{QR}\times \overrightarrow{PS}+\overrightarrow{RP}\times \overrightarrow{QS}|\]is equal to 4 times the area of the triangle ___.