badge image

Enroll For Free Now & Improve Your Performance.

User Icon
User Icon
User Icon
User Icon
User Icon

Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.

Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping
Grade: 12th pass


In a triangle ABC, FB is perpendicular on AC. DE is perpendicular on FB, where D is a point on BC. BE=3 AC=10 find area ADB?

one year ago

Answers : (2)

Vikas TU
12276 Points
Hiii Jitendr 
Please type the question clearly , you said that DE is perpendicular to FB , which is not in the figure . 
Figure says FE is perpendicular to DB , 
So, type the question clearly . 
We will help you . 
Good luck 
one year ago
Aditya Gupta
2065 Points
hello jitender this was an awesome question tbh. here also we use the formula for area of a triangle as ½ *ab*sinC.
let angle FBE= p, angle EAC= z. let AE=x.
now area of AEB= A= ½ *x*BE*sinAEB. here, BE= 3secp and angle AEB= 90 – p + z (because angle EAC= angle AEF).
so 2A= 3xsecp*sin(90 – p + z)= 3xsecp*cos(z – p)= 3xsecp(coszcosp+sinzsinp)= 3(xcosz+xsinztanp).....(1)
now, drop a perpendicular from E on AC at R. so, AR= xcosz. and ER= xsinz also, angle REC can be easily seen to be equal to p. so, tanp= RC/ER or RC= ERtanp= xsinztanp
now AR+RC= 10
so xcosz + xsinztanp= 10.......(2)
put (2) in (1)
2A= 3*10
or A = 15
kindly approve :)
if u have any further doubts feel free to ask.
one year ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution

Course Features

  • 53 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details