Kak tolong ini gimana​

Penjelasan dengan langkah-langkah:

Rumus :

Keliling = s+s+s+s

Luas = sisi × sisi

a. Sisi = 9 cm

K = s+s×2

= 9+9 × 2

= 18 × 2

= 36 cm

L = s × s

= 9 × 9

= 81 cm

b. Sisi : 19 cm

K = s +s ×2

= 19 + 19 × 2

= 57 cm

L = s×s

= 19 ×19

= 361 cm

c. Sisi = 11 cm

K = s+s+s+s

= 11 +11 ×2

= 22 +22

= 44 cm

L = s ×s

= 11 × 11

= 121 cm

d. Sisi: 28 cm

K = s+s×2

= 28 +28 ×2

= 84

L = s×s

= 28 × 28

= 784 cm

e. Sisi : 14 cm

K = s+s+s+s

= 14+14+14+14

= 56 cm

L = s×s

= 14 ×14

= 196

f. Sisi : 36 cm

K = s+s×2

= 36 +36 ×2

= 108 cm

L = s×s

= 36 × 36

= 1.296 cm

Intinya, matematika itu inget rumus aja, pasti kamu bisa. SEMANGAT DEK

Maaf kalau ada salah