15)ABC triunghi dreptunghic
m(<A)=90 grade
AB=15 cm
AD=12 cm
D€BC
_________
BC,AC,sin C,cos C,tg B,ctg B?

16)ABC triunghi dreptunghic
m(<A)=90 grade
m(<B)=30 grade
AB=18
√3
AD perpendicular BC
D€(BC)
___________
AC,BC,inaltimea AD?


1

Răspunsuri

Cel mai inteligent răspuns!
2014-03-14T16:44:35+02:00
Te ajut la 16.

tg30 = AC/18√3 =>AC = 18cm;

BC = 2AC( cf T < 30 de grade) => BC = 36 cm;

AD = 9
√3 cf. T a 2- a a inaltimii;

Bafta!