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L = ( x + 3 ) cm
Kell = 2p + 2l
46 = 2(2x + 5 ) + 2 ( x + 3 )
46 = 4x + 10 + 2x + 6
46 = 6x + 16
6x = 46 - 16
6x = 30
6x = 5
maka panjang = 2x + 5
= 2 ( 5 ) + 5
= 10 + 5
= 15 cm
maka Lebar = ( x + 3 )
= 5 + 3
= 8 cm