MY CART (5)

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

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        
If the line hx+KY=1/a touches the circle x²+y²=a² then the locus of (h,k) is circle of radius
1)1/a
2)a²
3)a
4)1/a²
10 months ago

Answers : (1)

Shukant Pal
25 Points
							
In this question, you just need to apply the condition of tangency of a line w.r.t to a circle, .i.e, perpendicular distance of the line from the center of the circle is equal to its radius.
 
The equation of the line is – hx + ky – 1/a = 0 and C(0, 0) and radius of circle is ‘a’.
 
Thus, |[0*h + 0*k – 1/a] / sqrt(h2 + k2)]| = a.
 
Solving this you will get – sqrt(h2 + k2) = 1/a2 or radius of circle is 4) 1/a2
10 months ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 1,590 off

COUPON CODE: SELF10


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


Get Extra Rs. 148 off

COUPON CODE: SELF10

Ask Experts

Have any Question? Ask Experts

Post Question

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