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=2.(42+27,5)
=2.69,5
=139 cm
L=p.l
=42.27,5
=1155 cm²
NB: tanda titik(.) artinya kali
kelilignya=2×42+2×27,5
=81+55=136cm
luasnya =panjang×lebar
=42×27,5=1155
semoga bermanfaat ^_^