Network
Panjang = 30 cm, lebar = 30 cm, tinggi = 30 cm
Luas permukaan = 2 x (pl + pt + lt)
= 2 x ((30x30) + (30x30) + (30x30)
= 2 x 2.700
= 5.400 cm²
Volume = p x l x t
= 30 x 30 x 30
= 9.000 cm³
d. Toples Tabung
jari - jari = 7cm, tinggi = 20cm
Luas permukaan = (2 x luas alas) + (keliling alas x tinggi)
= (2 x pi x r x r ) + (pi x diameter x tinggi)
= (2 x 22/7 x 7 x 7) + (22/7 x 2 x 7 x 20)
= 308 + 880
= 1.188 cm²
Volume = luas alas x tinggi
= pi x r x r x t
= 22/7 x 7 x 7 x 20
= 3.080 cm³
e. Gelas
jari - jari = 3,5cm, tinggi = 10cm
Luas permukaan = (2 x luas alas) + (keliling alas x tinggi)
= (2 x pi x r x r ) + (pi x diameter x tinggi)
= (2 x 22/7 x 3,5 x 3,5) + (22/7 x 2 x 3,5 x 10)
= 77 + 220
= 297 cm²
