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Verified answer
Keliling persegi 14x14=56
keliling persegi 2
4x18=72
perbandingan 56:72
luas 1
14x14=144
luas 2
18x18=324
perbandingan 144:324
Kelas: SMP VII
Materi: Perbandingan
Misalkan:
Sisi persegi 1 = 14 cm
Sisi persegi 2 = 18 cm
Pebandingan keliling:
Keliling persegi 1 : Keliling persegi 2
= 4 × sisi persegi 1 : 4 × sisi persegi 2
= 4 × 14 : 4 × 18
= 56 : 72
= (56 ÷ 8) : (72 ÷ 8)
= 7 : 9
Perbandingan luas:
Luas persegi 1 : Luas persegi 2
= (sisi persegi 1)² : (sisi persegi 2)²
= 14² : 18²
= 196 : 324
= (196 ÷ 4) : (324 ÷ 4)
= 49 : 81
Jadi,
Perbandingan keliling = 7 : 9
Perbandingan luas = 49 : 81