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r² = garis pelukis² - tinggi²
r² = 25² - 24²
r² = 625 - 576
r² = 49
r = √49 = 7cm
Luas selimut kerucut = π×r×s
Luas selimut kerucut = 22/7 × 7 × 25 = 550 cm²
22/7 x 7 x 25 = 550