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=1/2|AB|
|AB|²=(3+5)²+(-2-4)²=64+36=100
|AB|=10
r=5
P=25π
wiec promien
r = 0,5 * d = 0,5 * 10 = 5
wiedzac ze pole kola
P = π * r² = π * 5² = 25π