tolong pls mtk pls aku ribet nih pls.....

13. Rumus = π×r×r×t + p×l×t
= 22/7 ×14×14×20 + 28×28×20
= 12.320 + 15.680
= 28.000 cm
14. Rumus = π×r×r×t + π×r×r×t
= 22/7 ×5×5×7 +22/7×10×10×14
= 550 + 4.400
= 4.950 cm
15.Rumus = p×l×t + π×r×r×t
= 7×6×5 + 3,14×1,75×1,75×3
= 210 + 28.84875
=238.84875dm
:-)