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a - bok kwadratu
d = a√2
d = √2 · √2 = 2 cm
R = 1/2 d = 1/2 · 2 = 1 cm
h = wysokość trójkąta równobocznego
a - bok trójkąta równ.
h =
h = = 3√3
R = h = · 3√3 = 2√3 cm