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d = 14 cm / r = 7 cm
Ditanyai : L permukaan tabung = ?
Jawab:
L permukaan tabung = 2.π.r(r+t)
= 2.22/7.7(7+21)
= 44.28
= 1232 cm2
2.πr²+2πrt
2.22/7.7²+2. 22/7.7.21
308 + 924=
1232