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panjang = ( x+5 ) cm
Keliling = 30 cm
2 × ( pjg + lbr ) = 30
pjg + lbr = 30/2= 15
( x+5 ) + x = 15
2x + 5 = 15
2x = 10
x = 5
maka
panjang = x +5 = 5+5 = 10 cm