The hypotenuse is the longest side in a right triangle, which is different from the long leg. The long leg is the leg opposite the 60degree angle.
Two of the most common right triangles are 306090 and the 454590 degree triangles. All 306090 triangles have sides with the same basic ratio. If you look at the 30–60–90degree triangle in radians, it translates to the following:The figure illustrates the ratio of the sides for the 306090degree triangle.

Type 1: You know the short leg (the side across from the 30degree angle). Double its length to find the hypotenuse. You can multiply the short side by the square root of 3 to find the long leg.

Type 2: You know the hypotenuse. Divide the hypotenuse by 2 to find the short side. Multiply this answer by the square root of 3 to find the long leg.

Type 3: You know the long leg (the side across from the 60degree angle). Divide this side by the square root of 3 to find the short side. Double that figure to find the hypotenuse.
Finding the other sides of a 306090 triangle when you know the hypotenuse
Because you have the hypotenuse TR = 14, you can divide by 2 to get the short side: RI = 7. Now you multiply this length by the square root of 3 to get the long side: