No.
A chord is a straight segment that joins two points of the circumference. It starts at a point in the circumference and ends at other point in the circumference.
The radius goes from the center of the circle (which is not on the circumference) to one point of the circumference.
The diameter is a chord (the largest chord possible); but not the radius.
Answer:
Midpoint is
Step-by-step explanation:
A line segment refers to line that has two endpoints.
Let
be the endpoints of a line segment.
Midpoint of the line segment is given by 
Take the given points as follows:

Midpoint of a line segment 

By dividing it by a number that = to it
Answer:
31.42
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Step-by-step explanation: