di bantu no 4-5 nya ya ka,pliss buat besokk ni,sama caranya yah

4. L = P x L
80 = P x  8 
P = 80/8 = 10 cm
 
K = 2 x P + 2 x L
2 x 10 + 2 x 8 = 20 + 16 = 36

5a
p = x
l= x-3

b.K = 2 x ( P + L)
108 = 2(2x + x-3)
108= 2(3x-3)
108=6x -6
-6x = -108-6
-6x = -114
6x = 114
x=19

C. P = 2x = 2 x19= 38
L = 2(x-3) = 2 (19-3) = 32

D. L = P x L
L = 38 x 32 = 1216 cm^2