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What is the formula for the length of chord of contact of a circle?

What is the formula for the length of chord of contact of a circle?

Grade:12th pass

1 Answers

Vikas TU
14149 Points
5 years ago
length of chord of contact of tangents drawn from point (x1,y1) to the parabola y2=4ax is  
 
   = {(y12 -4ax1)(y12 +4a2)}^1/2 /a
 

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