Question

In triunghiul dreptunghic ABC,m( Daca AC=12cm si tgC=1,25.
Aflati : AB,BC,cosB,sinB.

Va rog frumos,eu am facut ceva,ceva dar la BC imi da un nr foarte urat.

Answer 1

tg C=AB/AC
1,25=AB/12
AB=15
BC²=12²+15²=144+225=369
BC=√369
BC=3√41
cos B=AB/BC=15/3√41=5√41/41
 sin B=AC/BC=12/3√41=4√41/41