perbandingan panjang dan lebar persegi panjang 4:3 jika keliling 42cm berapa panjang dan lebar masing masing

K = 42cm
4x = panjang
3x = lebar

K=2(p+l)
K=2(4x+3x)
K=2(7x)
K=14x
42=14x
x=42/14
x=3

p=4x
=4(3)
=12cm
l=3x
=3(3)
=9cm

Keliling = 42 cm
Panjang = 4a
Lebar = 3a

Keliling = 2 × (panjang + lebar)
42 = 2 × (4a + 3a)
42 = 2 × 7a
42 = 14a
a = 42/14
a = 3 cm

Panjang = 4a
= 4 × 3
= 12 cm
Lebar = 3a
= 3 × 3
= 9 cm