Deepa wants to make the art in her room. She draw the circles on the wall in the row as shown in the figure. The dimensions of the wall are \(6 \ m \times 4 \ m\) and it is covered with circle design of diameters \(50 \ cm\), as shown in the figure.
Based on the above information, answer the following questions.
1. Number of circular design along length of room is
2. Total number of circular design equals to
3. Area covered by each circular design is
4. Area of rectangular wall is