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7x(5) = 140
35x = 140
x = 140/35
x= 4
sisi sejajar
3x = 12cm
4x= 16cm
140 = 1/2 ( 3x + 4x ) 10
140 = 5 ( 7x )
140 = 35x
x = 140/35 = 4
Sisi Sejajar
a) 3x = 3 ( 4 ) = 12 cm
b) 4x = 4 ( 4 ) = 16 cm