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यदि |a|=10, |b|=2 तथा a.b.=12 है तब `|axxb|` का मान क्या हैA. 12B. 16C. 20D. 24 |
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Answer» Correct Answer - B दिया है `|a|=10, |b|=2` तथा a.b=12 `Rightarrow |a||b| cos theta=12` `Rightarrow 10.2. cos theta=12 ` `Rightarrow cos theta=3//5....(i)` `Rightarrow cos theta=3//5....(i)` `therefore sin theta=sqrt(1-cos^(2)theta)` `=sqrt(1-9//25)=(4)/(5)` `|axxb|=|a||b| sin theta hatn|` `=|a||b| sin theta||hatn|` `=10.2.1 . |(4)/(5)|` `=20xx(4)/(5)=4xx4=16` |
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