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x- jeden bok
y- drugi bok
1.35 m - wysokość.
405= x * y * 1.35 /: 1.35
300 = x * y
x/y = 4/3
4y = 3x
y = 3x / 4
300 = x * (3x / 4)
300 = 3x² / 4 /*4
1200 = 3x²
x² = 400
x= 20
y= (3*20)/4 = 15
x=20 i y = 15