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caranya: 3 : 5
8
8-5=3*3=9 cm
=
kalikan silang
2 ( 8 + X ) = 5 x 8
16 + 2X = 40
2X = 40 - 16
2X = 24
X = 24/2
X = 12
Jadi panjang CE = 12 cm
smoga membantu .....