a. If the radius is 2, what is the equation of the circle?
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HINT: The equation below will graph a circle with center (h, k) and radius r.
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Expressão 6: left parenthesis, "x" minus "h" , right parenthesis squared plus left parenthesis, "y" minus "k" , right parenthesis squared equals "r" squaredx−h2+y−k2=r2
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b. If the radius is 3, what is the equation of the circle?