suatu persegi memiliki panjang 18cm dan lebar(x-3)cm.jika luas 198cm2 maka keliling nya adalah

Luas = p x l
198 = 18 ( x - 3 )
198 = 18x - 54
198+54 = 18x
252 = 18x
14 = x

Lebar
= x - 3
= 14 - 3
= 11 cm

Keliling
= 2 ( p + l )
= 2 ( 18 + 11 )
= 2 ( 29 )
= 58 cm

L = p × l
198 = 18 (x - 3)
198 = 18x - 54
18x = 198 + 54
18x = 252
x = 252/18
x = 14

K = 2 × (p + l)
= 2 × (18 + (x - 3))
= 2 × (18 + (14 - 3))
= 2 × (18 + 11)
= 2 × 29
= 58 cm