Which triangle is a 30 -60 -90 degree triangle?

Answer:
The first one
Step-by-step explanation:
short side: x=5
long side: x=5
hypotenues: 5·2=10
Sides of a 30°-60°-90° triangle:
short side: x
long side: [tex]x\sqrt{3}[/tex]
hypotenues: 2x