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OpenStudy (anonymous):
If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is....
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OpenStudy (amistre64):
x^2+y^2 = r^2 .... compare
OpenStudy (anonymous):
no its the formula for the circle with its centre at its origin
OpenStudy (anonymous):
huh?
OpenStudy (anonymous):
he is right but a small change (x-h)^+(y-k)^=r^ r^=36 r=6
OpenStudy (amistre64):
a circles radius doent change just becuase you center it someplace else .....
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OpenStudy (anonymous):
that's correct the euation you gave can be used to find the radius but if we expand and find something else it would be wrong
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