Answer:PLZ MARK BRAINLIST
Draw a line from the center of the circle to the chord to form a right triangle.
The radius (20) forms the hypotenuse of the right triangle and distance from the center to the chord (16) forms a leg.
Use the Pythagorean Theorem to find the length of the other leg x (which would be 1/2 the length of the chord):
x^2 + 16^2 = 20^
x = 12
So the entire chord length = 12 * 2 = 24 units