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400 + 441 = c²
841 = c²
c = 29
Pole wynosi:
P = ½a*b
P = ½20*21
P = 10*21
P = 210
Promień obliczymy ze wzoru:
r = 2*P/(a+b+c)
r = 2*210/(20+21+29)
r = 410/70
r = 5,9
r ≈ 6