Mathematics, 28.07.2019 03:30, genyjoannerubiera

Which is the standard equation for a circle centered at the origin with radius r? a. x2 + y2 = r b. x2 = y2 + r2 c. x + y = r d. x2 + y2 = r2

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Which is the standard equation for a circle centered at the origin with radius r? a. x2 + y2 = r b....