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=22/7 . (7)² + 22/7 . 7 . 25
= 154 + 550
= 704
= √(49 + 576)
= √625
= 25 cm
Luas permukaan = πr(r + s)
= 22/7 x 7(7 + 25)
= 22(32)
= 704 cm²