my friends give me this answer please
Attachments:

Answers
Answered by
2
Search for questions, posts and chapters
Question
Bookmark
In an equilateral triangle ABC, D is a point on side BC such that 4BD = BC. Prove that 16AD
2
= 13 BC
2
.
Medium
Solution
verified
Verified by Toppr
ABC is an equilateral triangle in which BD=
4
BC
Drawn AE perpendicular to BC
Since AE is perpendicular to BC then BE=EC=
2
BC
[In equilateral triangle perpendicular drawn from vertex to base bisects the base]
In △AED
AD²=AE
Putting the value of AE
2
from (2) in (1), we get
[As △ABC is an equilateral triangle]
Similar questions