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=2 . 3,14 .6,5 .18 + 3,14 .6,5. 6,5
=734,76 + 132,665
=867,425
2. luas alas = 192,5 : 5 =38,5
phi.r^2 = 38,5
r = akar ( 38,5 : 22/7)
r = akar (12,25)
r = 3,5 cm
3. 2.phi.r.t = 7536
2. 3,14. r. 40 = 7536
251,2.r = 7536
r = 7536 / 251,2
r = 30 cm
V = phi.r.r.t
= 3,14 . 30. 30. 40
= 113.040