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Consider a triangular plot ABC with sides AB = 7 m, BC = 5 m and CA = 6 m. A vertical lamp post at the midpoint D of AC subtends

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Consider a triangular plot ABC with sides AB = 7 m, BC = 5 m and CA = 6 m. A vertical lamp post at the midpoint D of AC subtends an angle 30° at B. The height (in m) of the lamp-post is

(1) 3/2 √21

(2) 2/3 √21

(3) 2√21

(4) 7√3

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2 Answers

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Best answer

Correct option: (2)

Explanation:

+1 vote
by (66.0k points)

Correct option: (2) 2/3 √21

Explanation: 

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