tolong jawab no.5 dan 6 mohon bantuannya pls bantu ya

5. K = 2(p + l)
180 = 2(5x + 4x)
90 = 5x + 4x
9x = 90
x = 10

Maka p = 5(10) = 50cm
l = 4(10) = 40cm

L = pxl
50 x 40 = 2000cm²

6. K = 4s
64 = 4s
s = 16cm

Maka L = s²
= 16 x 16
= 256cm²