Question

Triunghiul ABC este dreptunghic in A si AB=12cm, AC=5 cm. Sa se calculeze sinB, sinC, cosB,cosC,tgB,tgC.

Answer 1

B
|
|
|
|
A_______C

BC^2=144+25=169 =>BC=13
sinB=AC/BC=5/13
sinC=AB/BC=12/13
cosB=AB/BC=12/13
cosC=AC/BC=5/13
tgB=AC/AB=5/12
tgC=AB/AC=12/5

Answer 2

In ∆ ABC dr =>TP
AB² +AC² =BC²
12²+5²=BC²
144+25=BC²
BC² =√169
BC=13 cm
sin B = AC/BC = 5/13
sin C = AB/BC =12/13
cos C = AC/BC =5/13
cos B =AB/BC = 12/13
tg B = AC/AB =5/12
tg C = AB/AC =12/5