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1/3 x La x t = 560
1/3 x 12 x La = 560
4 La = 560
La = 560/4
La = 140
jawabannya 140 cm²
560 = 1/3 x alas x 12
560 : 12 : 1/3 = alas
560 x 1/12 x 3 = alas
560 x 1/4 = alas
140 = alas
maka luas alas = 140 m²