tlg jawab no 15...besok ujian 50 poin

15.
panjang : lebar = 6 : 5
panjang = 6/5 x lebar

keliling = 198 m
2(p + l) = 198 m
p + l = 198 / 2
p + l = 99
6/5 l + l = 99
11/5 l = 99
l = 99 : 11/5
l = 99 x 5/11
l = 45 m

p = 6/5 x l
p = 6/5 x 45
p = 6 x 9
p = 54 m

Luas = p x l
L = 54 m x 45 m
L = 2.430 m²
L = (2.430 x 10.000) cm²
L = 24.300.000 cm²