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if the line lx + my = 1 touches the circle x 2 + y 2 = a 2 Then the point (l , m) lies on the circle (a) a 2 (x 2 +y 2 ) = 4 (b) a 2 (x 2 +y 2 ) = 3 [c] a 2 (x 2 +y 2 ) = 2 (d) a 2 (x 2 +y 2 ) = 1 choose the correct option

if the line lx + my = 1 touches the circle x2 + y2 = a2
Then the point (l , m) lies on the circle
 
(a) a2(x2+y2) = 4
(b) a2(x2+y2) = 3
[c] a2(x2+y2) = 2
(d) a2(x2+y2) = 1
 
choose the correct option

Grade:11

1 Answers

Charchit Tailong
askIITians Faculty 147 Points
6 years ago
Follow the equation of tangent to the circle.
Compare l and m.
Get values.
Again put l and m in the equations.

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