Posted by Ghanny on Monday, April 12, 2010 at 6:37pm.
Total surface area = πrs + πr^2
Since πr^2 is the area of base, πrs = area of lateral surface.
Use Pythagorean Theorem to find s, the distance along the side from tip to base.
s^2 = h^2 + r^2
I'll let you do the calculations.
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