Set up the formula for arc length. Since we know 2 sides of this triangle we will use the Pythagorean theorem to solve for x. Constructing an altitude from any base divides the equilateral triangle into two right triangles each one of which has a hypotenuse equal to the original equilateral triangles side and a leg ½ that length.
Find the Length Divide the length of the side associated with the angle by the value of the sin of that angle.
Find the distance between -28 and -7-5. Plug the length of the circles radius into the formula. Call this new number X for the purpose of this example. The is the mathematical symbol for degrees.