.terlampirngasal auto Warn
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