folosim teorema inaltimi ad=rdcd*bd 12=rd9cd 12=3cd cd=4 bc=bd+cd bc=9+4 bc=13 folosim teorema lui pitagora in triunghiul adc ac²=ad²+cd² ac²=12²+4² ac=rd160 ac=12,65 in trunghiul abc ab²=bc²-ac² ab=18,13 cm sin b=ac/bc sin b=12,65/13 sin b=0,973 cos b=ab/bc cosb=18,13/13 cos b=1,394 tg c=ab/ac tg c=18,13/12,65 tg c=1,433 ctg c=ac/ab ctg c= 12,65/18,13 ctg c=0,697 te rog sa verifici si tu calculele
