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360 - 300 = 60
60 : 2 = 30
kąt osty wynosi 30*
P= a^2 * sin30*
a możemy wyliczyć z własności trójkąta (30*,60*,90*)
(a) = 12
(2a) = 24
a= 24
P = 24 *1/2 = 12
P=12 [j^2]