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81 = 2 (5x+4x)
81 = 2(9x)
81 = 18 x
x = 81 /18
x = 4,5 m
panjang = 5x = 5.4,5 = 22,5 m
lebar = 4x = 4.4,5 = 18 m
Luas ladang = p x l
= 22,5 m x 18 m
= 405 m²
5+4=9
5/9×81=45cm
4/9×81=36cm
45/2=22.5 cm
36/2=18 cm
L Persegi panjang = p×l
22.5×18=405 cm2