tolong dijawab kak yang nomor 9

p : l = 5 : 2
p : l = 5x : 2x

L = 90
p×l = 90
5x × 2x = 90
10x^2 = 90
x^2 = 90/10
x^2 = 9
x = akar9
x = 3 cm

panjang = 5x = 5×3 = 15 cm

sisi persegi = 1/3 × p = 1/3 × 15 = 5 cm

Luas Persegi = 5×5 = 25 cm^2