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r = 14cm - promień
z tw. Pitagorasa:
AB² + BC² = BC²
niech AB=BC=a
2a² = 4r² |:2
a² = 2*196 = 392
a = √392 = 2√98
Pole = 1/2 * a * a = 1/2*a²
Pole = 1/2*392 = 196cm²
:)