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c=20÷2=10
z=2×a
z tw. Pitagorasa
a² = r² - c²
a²=12²-10²
a²=144-100
a²=44
a = 2√11
z= 2×2√11=4√11
c=20÷2=10
z=2×a
z twierdzenia Pitagorasa
a² = r² - c²
a²=12²-10²
a²=144-100
a²=44
a = 2√11
z= 2×2√11=4√11