Question

An angle whose vertex is at the center of a circle is a middle angle of that circle.
A. True
B. False

Answer 1

B. False 

Because n angle whose vertex is at the center of a circle is a CENTRAL angle of that circle

Answer 2

An angle whose vertex is at the center of a circle is a middle angle of that circle.  

This is false because there can be numerous angles in the center of a circle. Moreover, the angle whose vertex is at the center is called a central angle. The two endpoints of this angle and located at the circumference or outline of the circle and the vertex is located at the center of that circle.