Dau 30 de puncte si coroana pls am nevoie neaparat vă rog eu frumos

Răspuns:
dc=25-9=16cm
AB ^2=9×25
AB=15 cm
AC^2=BC^2 - AB^2
AC^2=25^2-15^2
AC^2=625-225=400
AC=20cm
AD=AB×AC/BC
AD=15×20/25=300/25=12cm
P=15+20+25=60cm