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20 x 4 = 80
8x4 = 32
60+80+32 = 172
180 - 172 = 8cm
= 4 ( 15+20+8)
= 4 ( 43 )
= 172
sisa
b = 1,8(100) - 172
= 180 - 172
= 8cm
jawabanya 8cm