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OpenStudy (anonymous):
The equation of a circle is (x + 7)^2 + (y + 2)^2 = 49. Determine the length of the diameter.
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OpenStudy (anonymous):
A. 7 B. 49 C. 9 D. 14
OpenStudy (anonymous):
Use the formula of a circle (x - a) ^ 2 + (y - b) ^ 2 = r ^2 r = radius so d = 2 x radius.
OpenStudy (anonymous):
still confused, im not that good at geometry
OpenStudy (anonymous):
r^2 is that 49
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