Acircular plate has a crack along the line ab, as shown below:

a circular plate is shown. the center of the plate is labeled as a. b is a point on the circumference of the plate. a straight line joins the points a and b.

if a is the center of the plate, what is the segment ab called?

a. tangent of the plate
b. chord of the plate
c. radius of the plate
d. secant of the plate