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1A. p = 8 cm ; l = 6 cm
K = 2 (p + l)
K = 2 (8 + 6)
K = 2 × 14
K = 28 cm

B. p = 12 cm ; l = 10 cm
K = 2 (p + l)
K = 2 (12 + 10)
K = 2 × 22
K = 44 cm

C. p = 14 cm ; l = 9 cm
K = 2 (p + l)
K = 2 (14 + 9)
K = 2 × 23
K = 46 cm

D. p = 19 cm ; l = 12 cm
K = 2 (p + l)
K = 2 (19 + 12)
K = 2 × 31
K = 62 cm


2. L = 162 cm^2 ; l = 9 cm
L = p × l
162 = p × 9
p = 162 ÷ 9
p = 18 cm

3. K persegi = K persegi panjang

Keliling persegi ( s = 11 cm )
= 4 × s
= 4 × 11
= 44 cm

Persegi panjang
l = 10 cm
K = 44 cm

K = 2 (p + l)
44 = 2 (p + 10)
44 = 2p + 20
2p = 44 - 20
2p = 24
p = 24 ÷ 2
p = 12 cm


4. Panjang kawat = keliling persegi panjang = 1,05 m = 105 cm

p : l = 3 : 4
p = 3X
l = 4X

K = 2 (p + l)
105 = 2 (3X + 4X)
105 = 2 (7X)
105 = 14X
X = 105 ÷ 14
X = 7,5 cm

a. p = ...? ; l = ...?
p = 3X
p = 3 (7,5)
p = 22,5 cm

l = 4X
l = 4 (7,5)
l = 30 cm

b. L = ...?
L = p × l
L = 22,5 × 30
L = 675 cm^2


5. L = 320 m^2

p : l = 5 : 4
p = 5X
l = 4X

L = p × l
320 = 5X × 4X
320 = 20X^2
X^2 = 320 ÷ 20
X^2 = 16 cm
X = akar 16
X = 4 m

p = 5X
p = 5 (4)
p = 20 m

l = 4X
l = 4 (4)
l = 16 m


6. Ukuran ruangan = 12 m × 8 m ; ukuran keramik = 20 cm × 20 cm

Luas ruangan
= 12 m × 8 m
= 96 m^2
=960.000 cm^2

Luas Keramik
= 20 cm × 20 cm
= 400 cm^2

Jumlah Keramik yang di butuhkan
= 960.000 ÷ 400
= 2.400 keramik