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DN = 3cm
NC = 4cm
dit : MN =?
JAWAB :
BC : MN = DC:DN
25 : X = (DN+NC) : DN
25:X = (3+4) : 3
25/X = 7/3 ( KALI SILANG)
25*3 = 7*X
75=7X
X= 75/7
X= 10,71
X=11( DIBULATKAN )
Maa kalau salah. Terimakasih