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persegi panjang
L:Panjang × lebar
:30×15
:450 cm²
bangun 2
persegi
L:Sisi×Sisi
:15×15
:225 cm²
450+225:675 cm ²
terima kasih
*luas persegi =s×s
=15×15
=225
luas seluruh =225×3
=675.
hasil akhir 675.
kl ada kesalahan maaf