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Triunghiul ABC m(A=90)
m(c)=30 de grade
AB=6

Aflati: BC,AC,BD,DC,R,Aria!


Răspuns :

sin 30⁰=AB/BC
1/2=6/BC  ⇒ BC=12
AC=√(12²-6²)=√(144-36)=√108=6√3
AD²=6²-BD²=36-BD²
AD²=(6√3)²-(12-BD)²
36-BD² =108-144+24BD-BD²
36 =-36+24BD
24BD=72
BD=3
DC=12-3=9
AD=√3×9=3√3
R=12:2=6
A=BCxAD/2 = 12× 3√3/2=18√3