tolong kerjakan no 8 pake cara makasih

L = 7x × 5x
3.500 = 35x²
3.500/35 = x²
100 = x²
√100 = x
10 m = x

p = 7×10
p = 70 m
l = 5×10
l = 50 m

k = 2(p+l)
k = 2(70+50)
k = 2(120)
k = 240 m

semoga membantu