Răspuns:
TC
AB*AB=BD*BC
144=18*BD
BD=8cm
DC=BC-BD=10cm
AC*AC=BD*DC
324=36*DC
DC=9cm
DC=BC-BD=27cm
Explicație pas cu pas:
a) AB=12cm BC=18 cm
AC²=BC²-AB²=18²-12²=6×30 AC=6√5 cm
AC²=CD×BC teorema catetei
180=CD×18 ⇒CD=10 cm
b)AC=18 cm BC=36 cm
AC²=CD×BC 18²=CD×36 CD=324:36=9cm
BD=BC-CD=36-9=27 cm
