I.

6. K = 32 cm

p = 9 cm

l = ?

K = 2p + 2l

32 cm = (2 × 9 cm) + 2l

32 cm = 18 cm + 2l

2l = 32 cm - 18 cm

2l = 14 cm

l = 7 cm -> d.

7. a = 9cm

b = 12 cm

K = ?

c² = a² + b²

c² = 9² + 12²

c² = 81 + 144

c² = 225

c = √225

c = 15 cm

K = a + b + c

K = 9 cm + 12 cm + 15 cm

K = 36 cm -> d.

8. K = 69 cm

s = ?

s = 69 cm ÷ 3

s = 23 cm -> c.

9. AB = 10 cm

BC = 4 cm

DE = 3 cm

EF = 3 cm

K = ?

AG = BC = 4 cm

FG = DE = 3 cm

DG = EF = 3 cm

CD = AB - DG

CD = 10 cm - 3 cm

CD = 7 cm

K = AB + BC + CD + DE + EF + FG + AG

K = 10 cm + 4 cm + 7 cm + 3 cm + 3 cm + 3 cm + 4 cm

K = 34 cm -> b.

10. K = ?

AB = 8 cm

AD = 8 cm

BC = 10 cm

CD = 8 cm + 6 cm

CD = 14 cm

K = AB + BC + CD + AD

K = 8 cm + 10 cm + 14 cm + 8 cm

K = 40 cm -> c.

II.

1. K = ?

a. K = 30 + 24 + 14

K = 68 cm

b. K = (2 × 12) + (2 × 10)

K = 24 + 20

K = 44 cm

2. p = 1 m = 100 cm

l = 0,5 m = 50 cm

panjang pita = ?

panjang pita = K

panjang pita = (2 × 100) + (2 × 50)

panjang pita = 200 + 100

panjang pita = 300 cm

3. s = 10 m

jarak antar pohon = 2 m

jumlah pohon = ?

jumlah pohon = K ÷ jarak antar pohon

jumlah pohon = (4 × 10) ÷ 2

jumlah pohon = 40 ÷ 2

jumlah pohon = 20

4. p = ?

2p + 2l = 4s

2p + (2 × 40) = 4 × 25

2p + 80 = 100

2p = 100 - 80

2p = 20

p = 10 cm