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Old 07-01-2009, 06:28 PM   #17
JogaBonito1502's Avatar
Join Date: Jan 2008
Location: U.S.
Posts: 7,841
Default Re: Math Equation for you all

Originally Posted by superman22x View Post
If I graph the circle with center, (0,-294), and then graph, "y=4, y=8, y=12... y=80" I can just find the intersections of the lines and the circle, and that will be the lengths correct?
What is the equation of a circle again in Y= form?... (x-h)^2 + (y-k)^2 = r^2
So... x^2 + (y + 294)^2 = 294^2

x^2 + y^2 + 588y + 86436 = 86436
- 86436 -86436
x^2 + y^2 + 588y = 0

Anyone want to help me from here? I know... basic algebra 2, but I'm not sure if I am doing right so far....
Graph the circle with center (0,0). Then find the equation of the tangent line you mentioned. Use the vertical lines and find intersections with the circles and the tangent line. Compare the y values of corresponding x values at the intersections on every x = 4. This should be the length you're looking for.
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