What is another word for semi diameter?
Pronunciation: [sˈɛmi da͡ɪˈamɪtə] (IPA) 
A semi diameter is half of the diameter of a circle or sphere. Some possible synonyms for this term include the radius, which is the distance from the center of a circle to its perimeter, as well as the half diameter, which is the same as the semi diameter. Other related terms might include circumference, which is the distance around the edge of a circle, or volume, which refers to the space contained within a sphere or other three-dimensional shape. These terms can all be useful when describing the size, shape, or dimensions of circular or spherical objects in mathematical or scientific contexts.
