The distance between any point on a circle and the centre is called

Radius of a circle $=$ _____ $\times$ Diameter. (Input answer in decimals)

A simple closed curve whose each point is equidistant from a fixed point in it is called _____.

Half of a circle is called as_____. 

Choose from options (Chord/Sector/Semicircle/ Segment) 

Diameter is the shortest chord in the circle.

The centre of the circle lies on its diameter.

Each arc of a circle is a semi-circle.