r=5 cm 5²=3²+x²25=9+x²25-9=x²16=x²√16=x4=xdł cięciwy 2x2×4=8
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r=5 cm
5²=3²+x²
25=9+x²
25-9=x²
16=x²
√16=x
4=x
dł cięciwy 2x
2×4=8