Page 116 - MATEMATIKA KELAS 3 SD

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12 cm

21 cm

12 cm

21 cm
Keliling = ... cm Keliling = ... cm

Latihan 2

Hitunglah keliling persegi, jika panjang sisinya adalah:
1. 7 cm 6. 15 cm
2. 4 cm 7. 17 cm
3. 2 cm 8. 20 cm
4. 8 cm 9. 25 cm
5. 10 cm 10. 23 cm

B. Keliling Persegi Panjang

Perhatikan gambar persegi panjang di bawah ini!

G F
Keliling persegi panjang DEFG
5 cm sama dengan jumlah panjang
keempat sisinya.

D 7 cm E

Keliling DEFG = Panjang DE + panjang EF + panjang FG
+ panjang GD
= 7 cm + 5 cm + 7 cm + 5 cm
= (2 x 7 cm) + (2 x 5 cm)
= 14 cm + 10 cm
= 24 cm
Jadi, keliling persegi panjang DEFG adalah 24 cm

105
Pelajaran 5 Keliling dan Luas