1, chord length = =2Rsina.

2. Chord length = 2RSin (l * 180/π r).

R is the radius and a is the central angle. Arc length l, radius r.

On the Calculation of Elliptic Chord Length

D = √ (1+k) | x 1-x2 | and d = √ (1+1/k) | y1-y2 |. An ellipse is the trajectory of a moving point P. The sum of the distances from the moving point P to the fixed points F 1 and F2 in a plane is equal to a constant (greater than | F 1F2 |), and F1and F2 are called the two focuses of the ellipse.

Elliptic chord length formula is a mathematical formula. The general method to find the chord length when a straight line intersects a conic curve is to substitute the straight line y=kx+b into the curve equation, turn it into a quadratic equation about x (or about y), set the coordinates of the intersection point, and use Vieta's theorem and the chord length formula √( 1+K? )[(X 1+X2)？ -4 x 1 x2] Find the chord length.