Penjelasan dengan langkah-langkah:

4) B

Keliling = 2 x (Luas/lebar + lebar)

Keliling = 2 x (108/9 + 9)

Keliling = 2 x (12 + 9)

Keliling = 2 x 21

Keliling = 42 cm

5) A

Keliling = 2 x ( p + l)

p + l = Keliling/2

x+7 + 2x-3 = 38/2

3x + 4 = 19

3x = 19-4

2x = 10

lebar = 2x - 3

lebar = 10 - 3 = 7 cm

6) C

K = 4 x s

s = K/4

s = 63/4

s = (60+3)/4

s = 60/4 + 3/4

s = 15¾ cm

7) D

K = 4 x √Luas

K = 4 x √169

K = 4 x 13

K = 52 cm

8) C

Luas = (K/4)²

Luas = (100/4)²

Luas = 25²

Luas = 625 cm²

9) C

(ii) → sifat persegi

10) A

AD = BC

3x-4 = x+10

3x-x = 4+10

2x = 14

x = 14/2

x = 7

AD = 3(7)-4

AD = 21-4

AD = 17 cm

11) D

Luas = 8 x 7

Luas = 56 cm²