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a - bok kwadratu
Z funkcji trygonometrycznych mamy:
a/x = tg60
a = xtg60
a = x√3
Z podstawy podzielonej na odcinki mamy:
2x + a = 12
2x + x√3 = 12
x(2 + √3) = 12
x(2 + √3)(2 - √3) = 12(2 - √3)
x(4 - 3) = 12(2 - √3)
x = 12(2 - √3)
a = 12(2 - √3)√3
a = 12(2√3 - 3) [cm] <-------- bok kwadratu