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[" 21.Consider a triangular plot ABC wit...

[" 21.Consider a triangular plot ABC with sides "AB=7m,BC=5" and "CA=6m" .A vertical lamp-post "],[" at the mid point D of AC subtends an angle "30^(@)" at "B" .The height (in "m" ) of the lamp - post is "],[[" (A) "2sqrt(21)," (B) "(2)/(3)sqrt(21)," (C) "(3)/(2)sqrt(21)," (D) "7sqrt(3)]],[[" (A) "2sqrt(21)," (B) "(2)/(3)sqrt(21)," (C) "(3)/(2)sqrt(21)," (J) "7sqrt(3)]]

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