Answer:
the first one
Step-by-step explanation:
Note that the right triangle 90°- 60° - 30° has
legs 1 and [tex]\sqrt{3}[/tex] with hypotenuse 2
The first triangle has sides which are multiples of this special triangle
legs (1 × 5) and ([tex]\sqrt{3}[/tex] × 5) = 5 and 5[tex]\sqrt{3}[/tex]
with hypotenuse = (2 × 5) = 10
Hence the first triangle is the special triangle
