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B = 4/7 x 10.500 = Rp. 6.000
2. 180 - 45 - 55 = 80
sudut segitiga = A : B : C = 45 : 55 : 80
perbandingan kecil & besar = 45 : 80 = 9 : 16
3. L1 = = 4
K1 = 4 + 4 + 4 + 4 = 16
L2 = = 7
K2 = 7 + 7 + 7 + 7 = 28
perbandingan = 16 : 28 = 4 : 7