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t = 20
Luas permukaan :
= phi . r²
= 3,14 . 17.5²
= 961,625
volume:
= luas permukaan . t
= 961,625 . 20
= 19.232,5
22. 2,5. 17,5 .20 = 19250
luas = 2πr ( r+t ) =2 22/7 17,5 (17,5+20)
2. 22/7. 17,5 (37,5)
2. 22. 2,5 (37,5)
110 (37,5) = 4125