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jadi (3x +4+ x +6).2 = 392 ### (4x+10).2 = 392 ### 4x+10 = 196 ### 4x = 186 ### x = 46.5
panjang = 3.46,5 +4 = 143,5 cm
lebar = 46,5 + 6 = 52,5 cm