PQ=AB=5;
QR=BC=6;
PR=AC=7;
1.49)
∠A=40°
∠B=∠B₁=60°
∠C=∠C₁=80°
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PQ=AB=5;
QR=BC=6;
PR=AC=7;
1.49)
∠A=40°
∠B=∠B₁=60°
∠C=∠C₁=80°