the height of the right circular cone is 12 cm if the diameter of the base is 10 cm find total surface area
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l = √12²+5² = √144+25 = √169 = 13cm
T·S·A = πrl + πr² = πr(l+r)
= 22/7 × 5 (13+5)
= 22/7 × 5 × 18 = 282.85cm²
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