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2014-08-16T14:15:35+03:00
ΔABC

AB=6 cm  =>AB²=36 cm²
AC=8 cm  =>AC²=64 cm²
BC=10cm =>BC²=100cm²

100=36+64
BC²=AB²+AC²                                  =>ΔABC-dreptunghic, mas<A=90
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