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s² = 7² + 24²
s² = 49 + 576
s² = 625
s = 25 cm
Luas permukaan kerucut = πr² + πrs
= πr(r + s)
= 22/7 x 7 (7 + 25)
= 22/7 x 7 x 32
= 704 cm²