Question

determinati lungimea laturii AB dreptunghic in A,stiind ca BC=10 si m(unghi ascutit C)=30 grade

Answer 1

sin C = AB / BC 
sin30 = AB / 10 
1/2 = AB /10 
2AB =10 
AB = 10 :2 = 5

Answer 2

$sinC= \frac{AB}{BC} \\ \frac{1}{2}= \frac{AB}{10} \\ AB=5$