Răspuns:
Explicație pas cu pas:
c)AC²=BC²-AB²=29²-20²=9·49 ⇒AC=3·7=21 cm
T Catetei AB²=BD·BC ⇒400=BD·29 ⇒BD=13,8cm
DC=BC=BD=29-13,8=15,2 cm
AD=AB·AC/BC=21·20/29=420/29=14,48 cm
d)AB=12 cm BC=13 cm ⇒AC=5 cm
BD=AB²/BC=144/13=11,07 cm
DC=BC-BD=13-11,07=1,93cm
AD=AB·AC/BC=12·5/13=60/13=4,61 cm