Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET202420 May 2024Evening ShiftMathematicsCircleActual

If the locus of the mid points of the chords of the circle x^2+y^2=25 , which subtend a right angle at the origin is given by x^2 a^2 + y^2 a^2 =1 then |a|=

Options

  1. A2 5
  2. B5 2
  3. C2 25
  4. D5 2

Correct answer

B. 5 2

Step-by-step solution

x^2+y^2=25 r=5 Let midpoint of chord A B be C 4 = BC OB BC = 5 2 Let co-ordinates of C be (x₁, y₁ ) By Pythagoras theorem aligned & OB ^2= OC ^2+ BC ^2 & 25=x₁^2+y₁^2+ 25 2 25 2 =x₁^2+y₁^2 & . x₁^2 25 2 + y₁^2 25 2 =1 ,= 5 2 aligned

Practice Circle on Quantrex Academy →

More from Circle

A circle touches both the coordinate axes and the straight line L 4 x +3 y -6=0 in the first quadrant. If this circle lies below the line L =0 , then the equation of that circle is 2025If the smallest circle through the points of intersection of x^2+y^2=a^2 and x +y =p, 0 < p < a is x^2+y^2-a^2+ (x +y -p)=0 then = 2025If the lines 3 x-4 y+4=0 and 6 x-8 y-7=0 are the tangents to the same circle, then the area of that circle (in sq.units) is 2025Circles are drawn through the point (2,0) to cut intercepts of length 5 units on the X -axis. If their centre lie in the first quadrant, then their equation is 2025The circles x^2+y^2-2 x-4 y-4=0 and x^2+y^2+2 x+4 y-11=0 2025If the line 4 x-3 y+7=0 touches the circle x^2+y^2-6 x+4 y-12=0 at ( , ) , then +2 = 2025The slope of the common tangent drawn to the circles x^2+y^2-4 x+12 y-216=0 and x^2+y^2+6 x-12 y+36=0 is 2025If r₁ and r₂ are radii of two circles touching all the four circles (x r)^2+(y r)^2=r^2 , then r₁+r₂ r = 2025 Full Circle list All AP EAMCET PYQs