tolong jawabin yg no 4 aja ya soal buat bsk..

perbandingan = 7x : 5x

keliling = 2( 7x + 5x )
216 = 24x
216 : 24 = x
9 = x

Luas = p × l
= 7x × 5x
= (7×9) × (5×9)
= 63 × 45
= 2.835 cm^

#Maaf kalau salah