Jawaban:

Panjang = 15 cm

Lebar = 9 cm

Keliling = .....

= 2 (p + l)

= 2 (15 cm + 9 cm)

= 2 (24 cm)

= 48 cm

\begin{gathered} \\ \end{gathered}

b)

Lebar = 16 cm

Keliling = 88 cm

Keliling = 2 (p + l)

88 cm = 2 (p + 16 cm)

88 cm = (2 × p) + (2 × 16)

88 cm = 2p + 32 cm

2p = 88 cm - 32 cm

2p = 56 cm

p = 56 cm ÷ 2

p = 28 cm

\begin{gathered} \\ \end{gathered}

c)

Panjang = 45 cm

Keliling = 132 cm

Keliling = 2 (P + L)

132 cm = 2 (45 cm + L)

132 cm = (2 × 45 cm) + (2 × L)

132 cm = 90 + 2L

2L = 132 - 90

2L = 42

L = 42 ÷ 2

L = 21 cm

\begin{gathered} \\ \end{gathered}

d)

Panjang = 34 cm

Lebar = 22 cm

Keliling = .....

= 2 (p + l)

= 2 (34 cm + 22 cm)

= 2 (56 cm)

= 112 cm

\begin{gathered} \\ \end{gathered}

e)

Lebar = 77 cm

Keliling = 170 cm

Keliling = 2 (p + l)

170 cm = 2 (p + 77 cm)

170 cm = (2 × p) + (2 × 77)

170 cm = 2p + 154 cm

2p = 170 cm - 154 cm

2p = 16 cm

p = 16 cm ÷ 2

p = 8 cm