Question 981443
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A=total surface area=628cm^2; r=radius; s=slant height=17cm
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{{{A=pi*r*s+pi*r^2}}}
{{{628cm=3.14r^2+53.41r}}}
{{{0=3.14r^2+53.41r-628}}}*[invoke quadratic "r", 3.14, 53.41, -628 ]
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So radius=7.998 cm