Ответ:
1) ∠ab=∠ac+∠bc=32+74=106°
3) ∠bc=∠ab-∠ac=90-39=51°
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Ответ:
1) ∠ab=∠ac+∠bc=32+74=106°
3) ∠bc=∠ab-∠ac=90-39=51°