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V =12 mnt × 60 =720 dtk
W = V × D
= 720 × 0,192
= 138,24
27. lingkaran = 1/2×phi×r×r
= 1/2×22/7×7×7
= 77 cm2
trapesium = (a+b)×t×1/2
= (20+14)×14×1/2
= 34×7
=238 cm2 + 77
=315 cm2
29. luas permukaan =6× s2
=6×82
=6×64
= 384 cm2
30. volume = phi×r×r×t
= 22/7×7×7×10
=1540 cm3
Semoga membantu,jadikan yang terbaik ya