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1540 = 22/7. r². 10
1540 = 220/7. r²
1540. 7/220 = r²
7. 7 = r²
7 = r
a) jari'' alas tabung = 7 cm
b) L tab = 2 π r (r + t)
= 2. 22/7. 7 (7 + 10)
= 44.(17)
= 478 cm²