How do you find the rectangular equation for $r=5$ ?

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Answer 1 · 2016-11-21T01:41:38

Please see the explanation

Square both sides:

$r^2 = 5^2$

Substitute $x^2 + y^2$ for $r^2$ :

$x^2 + y^2 = 5^2$

Insert the center -0 into the x and y terms:

$(x - 0)^2 + (y - 0)^2 = 5^2$

This is the standard form for a circle whose center is $(0, 0)$ and the radius is 5.

How do you find the rectangular equation for r=5r=5?