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rumus keliling: 2p+2l
2(2x+3)+2(x+4)=56
4x+6+2x+8=56
6x=42
x=7
panjang= 2x+3
= 2(7)+3
= 14+3
= 17 (a)
keliling=2(panjang+lebar)
56cm=2((2x+3)+(x+4))
56cm=2(3x+7)
56cm=6x+14
6x =56-14 cm
6x =42cm
x=7cm
>panjangnya=2x+3=(2X7)+3=14+3=17(a)