JEE Main 2019 Mathematics question
Not in JEE syllabus
Consider a triangular plot ABC with sides AB = 7 m, BC = 5 m and CA = 6 m. A vertical lamp-post at the mid point D of AC subtends an angle 30º at B. The height (in m) of the lamp-post is:
Answer: (D)
Solution
Median ; h = BD tan 30° = .