SOLUTION: Find the equation of the circle with radius 6 that is tangent to both branches of the graph of y=|x|.

Question 246624: Find the equation of the circle with radius 6 that is tangent to both branches of the graph of y=|x|.
Answer by dabanfield(803) (Show Source): You can put this solution on YOUR website!
Let's say the center of the circle is C. Draw pependicular lines from C to the two tangent lines created by y = |x|. Let's say the two lines intersect the tangent line at points A and B respectively. Let's say the Origin is point O with coordinates (0,0).
The figure CAOB is a square with sides of length 6. Triangle CAO is a right isosceles triangle with sides of length 6. So the hypotenuse CO of CAO is sqrt(36+36) = sqrt(72) = 6*sqrt(2).
The cooredinates of C then are (0,6*sqrt(2)).
So we have a circle with radius 6 and center C at (0,6sqrt(2).
Plug these values into the equation of the standard form of a circle:
(x-h)^2 + (y-k)^2 = r^2 where (h,k) is the center and r is the radius of the circle.
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