Assume you mean the chord of a circle? If the angle between the two radii from the ends of the chord is A, and the radius of the circle is R, the chord length L will be
L = 2RsinA/2. You can prove this easily by joining the point bisecting the chord to the centre, you then have two rightangled triangles, with an included angle of A/2, and an opposite side of L/2. So sinA/2 = L/2R.
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You can use the cosine rule to calculate the central angle.
There is none since an angle does not have a length.
hypotenuse
The formula is Length X Width X Height.
Area = length*perpendicular height or 0.5*the product of its diagonals