tolong help me please!!!! besok dikumpulkan hanya nomor 21,23,27,dan 30

no 21
= 2πr
= 2(3.14).25
= 157

no 23
= kel lingkarang + kel trapezium
= 1/2 . π d + 20 + 25 + 35
= 31.4 +80
= 111.4

no 27
= V = πr²t
= 22/7(42/2)²20
=27,720

30
v= p x l x t
  = 220 x 110 x 50
  = 1.210.000 cm³
  = 1.210 dm³

terisi 4/5 
berarti 1.210 x 4/5
968 liter :)
CMIIW
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