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154+550=704cm²
550cm² = 22/7 x 7cm x s
550cm² = 22cm x s
550cm²/22cm = s
25cm = s
Luas permukaan = phi x r (r+s)
= 22/7 x 7cm (7cm+25cm)
= 22/7 x 7cm x 32cm
= 22cm x 32cm
= 704cm²