find the total surface area of a cone, if its slant height is21 m and diameter of its base is 24
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Answer:
Step-by-step explanation:
Total surface area of a cone
= πr(r+l)
= π(12)(12+21)
= 12π(33)
= 396π
= 396(3.14)
= 1243.44
Hence, the answer is 1243.44m²
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