tolong yak kak pakek cara yak makasih

Diagonal persegi itu sama panjangnya

4x + 6 = 2x + 18
4x - 2x = 18 - 6
2x = 12
x = 12/2
x = 6 cm

Panjang diagonal
= 4x + 6
= 4 (6) + 6
= 24 + 6
= 30 cm

d = 30
s x √2 = 30
s = 30 / √2
s = 30/2 √2
s = 15√2 cm

Luas persegi
= s x s
= 15√2 x 15√2
= (15 x 15) (√2 x √2)
= 225 x 2
= 450 cm²