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# Gradient and equation of tangent

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Say I have for example a circle with centre C(7,-5) passing through point A(6,-3)
(With tangent line and radius, AC, being perpendicular.)

1. How would I go about finding the gradient of the tangent?
2. How would I go about finding that the equation of the tangent at A is the line x=2y+12 ?
3. And how would I go about finding out that this line meets a second circle with
equation of x squared -24x +y squared +10y +149=0 in only one point?

##### Solution Summary

This shows how to find gradient and equation of a tangent to a circle.

##### Solution Preview

Say I have for example a circle with centre C(7,-5) passing through point A(6,-3)
(With tangent line and radius, AC, being perpendicular.)

1. How would I go about finding the gradient of the tangent?
First, we can compute the slope of the line CA, denoted by k,

So, the slope of the ...

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###### Education
• BSc , Wuhan Univ. China
• MA, Shandong Univ.
###### Recent Feedback
• "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
• "excellent work"
• "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
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