I got some questions that i just don't understand. Hopefully you guys can give me the answer and explain it for me? XD

1. A square sheet of tin is 14m on a side. What is the area of the largest circular disc that can be cut from this sheet? (Use 3/1/2 for pi)

2. A circular flower bed in a park is 18m in diameter. a) What is its area? b) Allowing 1/1/2 sq m for each plant, how many plants will be required for the flower bed? (use 3/1/2 for pi)

Thanks!