Ayuabryana
Apa bila keliling persegi panjang ialah 2 ( p + l ) perbandingan panjang dengan lebar 4 : 3 ( p + l )= 84/2 = 42 cm 4 + 3 = 7 panjang = 4/7 x 42 = 24 cm lebar = 3/7 x 42 = 18 cm kita buktikan K = 2 ( p + l ) K = 2 ( 24 + 18 ) K = 2 . 42 K = 84 cm
lebar = 3x
rumus keliling : 2(panjang + lebar)
2 (4x + 3x) = 84
14x = 84
x = 6
panjang = 4x = 4 dikali 6 = 24 cm
perbandingan panjang dengan lebar
4 : 3
( p + l )= 84/2
= 42 cm
4 + 3 = 7
panjang = 4/7 x 42
= 24 cm
lebar = 3/7 x 42
= 18 cm
kita buktikan
K = 2 ( p + l )
K = 2 ( 24 + 18 )
K = 2 . 42
K = 84 cm
Jadi panjangnya ialah 24 cm.