Q.
A. 1/8a(y1 - y2)(y2 + y3)(y3 + y1)
B. 1/4a(y1 + y2)(y2 + y3)(y3 + y1)
C. 1/8a(y1 - y2)(y2 - y3)(y3 - y1)
D. 1/4a(y1 - y2)(y2 - y3)(y3 - y1)
E. None of the above
Correct choice: C
Explanation: