A solid metal pin is in the shape of a cylinder with a radius of r r\,r mm and a height of 4 mm.
The volume of the metal pin is 121π 121\pi\,121π mm3^33.
Find the value of rrr.
92 exam-style questions on AQA GCSE Maths Cylinders. Each one has a worked solution and a mark scheme showing where the marks go.