Question

Vă rog din suflet, măcar a)! ​

Answer 1

ABC-Triunghi l m(∡A)=90°⇒AB²+AC²=BC²
m(∡A)=90° l =12²+AC²=18²
AD=h l =144+AC²=324⇒AC=
D∈(BC) l =
_____________l =6√5cm
a)CD=? l AD=== cm
b)BD=? l ΔACD
_____________l m(∡A)=90°⇒AC²=AD²+CD²
(6√5)²=(4√5)²+CD²
180=80+CD²
CD²=180-80
=100⇒CD=√100=10cm