Linii importante in triunghi- materiale utile pentru clasa aVI-a

Informatii despre:
-inaltimile intr-un triunghi;
- constructii ale liniilor importante in triunghi, cu ajutorul compasului si riglei;
- concurenta liniilor importante in triunghi.
http://www.youtube.com/watch?v=rZkTH2UMK8Q&feature=related
http://www.youtube.com/watch?v=SZ5IGSDgpzk&feature=relmfu
http://www.youtube.com/watch?v=6_KeGydqWAE&feature=channel
http://www.youtube.com/watch?v=vhJT1vuZ6Dw&feature=relmfu
http://www.youtube.com/watch?v=wDW8tMs4Mfs&feature=relmfu
http://www.slideshare.net/escorteanu/linii-imp-in-triunghi-5695605