Questions on Geometry: Circles and their properties answered by real tutors!

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Question 148393: graph the circle whose equation is x squared + y squared = 64. what is its radius? what do the equatons x squared + y squared = 1 and x squared + y squared = k all have in common? how do they differ?: graph the circle whose equation is x squared + y squared = 64. what is its radius? what do the equatons x squared + y squared = 1 and x squared + y squared = k all have in common? how do they differ?
Answer by Alan3354(1449) About Me  (Show Source):
You can put this solution on YOUR website!
1. graph the circle whose equation is x squared + y squared = 64. what is its radius?
2. what do the equations x squared + y squared = 1 and x squared + y squared = k all have in common? how do they differ?
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1. I don't think I can do graphs here, but
x^2 + y^2 = 8^2 is a circle about the origin of radius 8.
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2. Since there are no other terms, their centers are the origin.
Their radii are different, sqrt(1) and sqrt(k)