A 13 cm concrete cylindrical pipe has an outer radius of 6 cm and an inner radius of 4 cm as shown. Find the volume of concrete required to make the pipe, correct to two decimal places.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: A 13 cm concrete cylindrical pipe has an outer radius of 6 cm and an inner radius of 4 cm as shown. Find the volume of concrete required to make the pipe, correct to two decimal places.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: A 13 cm concrete cylindrical pipe has an outer radius of 6 cm and an inner radius of 4 cm as shown. Find the volume of concrete required to make the pipe, correct to two decimal places.