the angle is an angle and therefore doesn't have a length. If you want to find the length of the hypotenuse - the leg across from the right angle - it is the square-root of the other two legs each squared.
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In a right angles triangle the sides are named the hypotenuse (the side opposite the right angle) and the other two sides are called the adjacent and the opposite sides. 1) The sine of an angle = length of the opposite side ÷ length of the hypotenuse. 2) The cosine of an angle = length of the adjacent side ÷ length of the hypotenuse. Using 1) The length of the hypotenuse = length of the opposite side ÷ the sine of the angle. Using tables or a calculator obtain the sine of the angle and divide this into the length of the opposite side. The result will be the length of the hypotenuse.
As the relationship between the length and angle given are unclear a graphic explanation can be found at the link below
sin θ : 1 = the length of opposite side to angle θ : the length of the hypotenuse
There can be as many sizes as you want but the right angle always has an 90 degree angle in it but the length of the sides can be varied (they can be as long as or as short as you want). :)
(arc length / (radius * 2 * pi)) * 360 = angle