Question

Mă puteți ajuta, va rog va rog ​

Answer 1

Răspuns:

a) AD² = BD*DC   BD= AD²: DC= 8,4² :9,8= 70,56 :9,8=7,2

BC=BD+DC= 7,2+9,8=17

AB²=BD *BC= 7,2*17=122,4   AB= $\sqrt{122,4}$=11,063

AC²= DC*BC= 9,8 *17= 166,6  AC=$\sqrt{166,6}$=12,907

c)  AB= 12 dm =120 cm

BC=AB² : BD= 120*120 : 72=200

DC=BC- BD=200-72=128

AC² = BD* BC= 128*200=25600  AC= 160

AD² = BD*DC=128 *72=9216      AD=96