The value of the Hypotenus is 10.39
Using trigonometric concept; 
- Sine = opposite / Hypotenus 
Sin(60°) = 9 / Hypotenus 
0.8660 = 9 / Hypotenus 
Hypotenus = 9 / 0.8660
Hypotenus = 
The value of the Hypotenus is 10.39
Complete Question :
Calculate the length of LK