Question

Sa se rezolve triunghiul dreptunghic ABC in care A=90,AC=3 iar C=15 grade

Answer 1

Răspuns:

B

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A_________________________C

Dacă m(<ACB)=15° =>AB=BC/4 =>BC=4AB (teorema <15°)

AB^2 + AC^2 = BC^2 (T.Pit.)

AB^2 + 9 = 16AB^2

15AB^2 = 9

AB=3/rad15=3rad15/15 =>AB=rad15/5

BC=4rad15/5

m(<ABC)=180°-15°-90°=75°