Answer:
The number of students required for the performance = 81 students
Explanation:
The teacher wants to arrange the students in equal number of rows and columns.
The number of columns = 9.
Therefore, the number of rows must be 9 because the teacher wants to arrange the students in equal number of row and columns.
So, the matrix must be square matrix of 9 × 9.
The number of students required for the performance = 9 × 9 = 81 students
Herewith I have attached the array of students.