Question

Bună. E foarte urgent! Va rog foarte mult sa ma ajutati la ex. 5 si 6. Vă rog!!!! DAU COROANA!!!!!!! PROMIT!!!!!!!!!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

5)  Atr = b*h/2=12*8*sin30/2=12*8/2/2=24cm2

     Atr=0.5*6r2*6sin45=0.5*6r2*6/r2=0.5*36=18

  Atr=0.5*8r3*5sin60=0.5*8r3*5r3/2=0.5*8*5*3/2=40

6)   Atr echilateral =L*L*(r3/2)/2  => L=(A*4/r3)^0.5

  L=(25r3*4/r3)^0.5= r100=10cm

   L=(48r3*4/r3)^0.5=(6*8*4)^0.5=(3*2*2^3*2^2)^0.5=(2^6*3)^0.5=8*r3

   L=(225r3/*4/r3)^0.5=(15^2*2^2)^0.5=30

   L=(27r3*4/r3)^0.5=(3*3^2*2^2)^0.5=6*r3