Answer:
The word which describes the equal shares of the shape is quarters.
Explanation:
Consider the provided shape.
The provided shape is divided into 4 equal part.
If a whole is divided into 2 parts then we describe it as halves because each piece is one half.
If a whole is divided into three part then we describe it as thirds and if a whole is divided into 4 equal part, each part is one fourth of the whole and we describe it as quarters.
In the above figure each part is one fourth of the whole so we describe it as quarters.
Hence, the word which describes the equal shares of the shape is quarters.