Which of the following represents a chord, but not a diameter, of the circle? a. ts, b. sn, c. tr, d. mn

A diameter goes straight across the circle and passes through the center point (point M). A radius stops at the center point, making the line go halfway across the circle (basically half the diameter). A chord goes across the circle, but does not go through the center point. Therefore, the answer is C, because it does not go through the center point.