A) \[\frac{1}{2}\sqrt{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}\]
B) \[\frac{1}{2}\sqrt{{{b}^{2}}{{c}^{2}}+{{c}^{2}}{{a}^{2}}+{{a}^{2}}{{b}^{2}}}\]
C) \[\frac{1}{2}\sqrt{ab+bc+ac}\]
D) \[\frac{1}{2}\sqrt{{{a}^{2}}b+{{b}^{2}}c+{{c}^{2}}a}\]
Correct Answer: B
Solution :
Let OP be the normal from O to the plane of \[\Delta ABC,\] Let l, m, n be the direction cosines of OP Let s be the area of \[\Delta ABC\] Therefore,You need to login to perform this action.
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