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86/2 = 2l +7
2l = 43-7 = 36
l = 36/2 = 18
p = 25
ukuran : 25 m x 18 m
p = 25 m
l = 18 m
kell = 2 × (p + l)
86/ 2 = p + l
43 = p + l
43 = p + (p - 7)
43 = 2p - 7
43 + 7 = 2p
50 = 2p
p = 50/2
= 25 m
lebar = p - 7
= 25 - 7
= 18 m