Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 15)
A solid cone has base radius of 6.5 cm and a height of 6.3 cm. Calculate its total surface area.
235.1 cm²
410.4 cm²
334.4 cm²
256.3 cm²
Explanation
Surface area = πr(r + s), where s is the slant height which can be calculated via √(h² + r²) = √(6.3² + 6.5²) = 9.06. Surface area ≈ π * 6.5 * (6.5 + 9.06) = 334.4 cm²
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