Question 551080: how i do this?
find the equation of a circle centered at the origin, and having radius 1
find the equation of a circle centered at the origin and having radius 5
find the equation of a circle centered at the origin, and having radius ,/19
find the equation of a circle centered at the origin and having radius 3,/7
Answer by AnlytcPhil(1810)   (Show Source):
You can put this solution on YOUR website!
Substitute the value of the radius for r in
x² + y² = r²
For instance, to get the answer to
find the equation of a circle centered at the origin and having radius 5
just substitute 5 for r and get
x² + y² = 5²
and then do one more step, change 5² to 25
x² + y² = 25
That's the equation.
That's all there is to it!
Edwin
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