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19.) 3.080 cm kubik
20.) 420 cm kubik
v balok kecil = 12 x 8 x 5 = 480 cm³
terus dijumlah = 1.280 cm³
19. V tabung = r² t
= 3,14 . 10.10 .20 = 628 cm³
20. V limas segitiga = 1/3 . La. t
= 1/3 x 12.10 : 2 . 27 = 420 cm³