A solid metal rod in the shape of a cylinder has a radius of 4 mm and a height of h h\,h mm.
The total surface area of the rod is 90π 90\pi\,90π mm2^22.
Find the value of hhh.
92 exam-style questions on Edexcel GCSE Maths Cylinders. Each one has a worked solution and a mark scheme showing where the marks go.