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masurile unghiurilor unui triunghi dreptunghic stiind ca doua unghiuri au masurile de 4x+30 si 140-5x

Răspuns :

caz 1
∡A=4x+30°=90°  ⇒4x=60°⇒x=15°
∡B=140°-5x =140°-5×15°=140°-75°=65°
∡C=90°-65°=25°

caz 2
∡A=140°-5x=90°  ⇒5x=50°⇒x=10°
∡B=4x+30° =4×10°+30°=70°
∡C=90°-70°=20°