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18.

Volume tabung

= π x r² x t

= 22/7 x 7² x 35

= 22 x 7 x 35

= 5.390 cm³

19.

Luas permukaan

= 2(pl + pt + lt)

= 2(25×6 + 25×15 + 6×15)

= 2(150 + 375 + 90)

= 2 x 615

= 1.230 cm²

20.

volume bangun

= volume kubus + volume balok

= s³ + (p x l x t)

= 4³ + (5 x 4 x 10)

= 64 + 200

= 264 cm³