Show that the normal line at any point on the circle x2 + y2 = r2 passes through the origin

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.7: Distinguishable Permutations And Combinations
Problem 22E
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Show that the normal line at any point on the circle x2 + y2 = r2 passes through the origin

Expert Solution
Step 1

Assume that we have the circle of equation x2+y2=r2 and we want to get the normal equation at x0,y0.

So, we will calculate the differentiation at x0,y0 to get the slope of the tangent at x0,y0, then calculate the slope of

normal from the slope of tangent and finally calculate the normal equation to show that y-intercept is zero.

 

Getting the slopes of the tangent getting the differentiation firstly as follows

dx2+y2dx=dr2dx2x+2ydydx=0dydx=-xy

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