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11. 44 x 30/2 = 660 cm2
12. 53 x 46/2 = 1219 cm2
13. 22/7 x 21 x 21 = 22 x 3 x 21 (3 didapatkan dr mencoret 21 & 7) = 1386 cm2
14. 3,14 x 12 x 12 = 452,16 cm2