Question 1179312
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total surface area = area of base plus lateral surface area<br>
{{{285 = (pi(r^2))+(pi)(r)(l)}}}<br>
where l is the slant height.<br>
{{{285 = 25pi+(5pi)(l)}}}
{{{l = (285-25pi)/(5pi)}}} = 13.14366 to several decimal places.<br>