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A = 1/2 a t
A = 1/2 x 4 x 12.5
A = 25 m kuadrat
Luas daerah diarsir adalah luas persegi panjang dikurangi 4 kali luas segitiga; sehingga
L = (18x25) - (4 x 25)
L = 12 x 25 = 300 m kuadrat