4400 Higher June 2005 Paper 4 Q9
9 The formula for the curved surface area, \(A\), of a cylinder is
\(A = 2\pi rh\)
where \(r\) is the radius and \(h\) is the height.
Calculate the value of \(r\) when \(A = 19.8\) and \(h = 2.1\)
Give your answer correct to one decimal place.
(2)
| Scheme | Marks |
|---|---|
| \(19.8 = 2\pi \times r \times 2.1\) or \(19.8 / (2\pi \times 2.1)\) | M1 |
| 1.5 or better | A1 |
| (2) | |
| (2 marks) |
Notes
M1: Or \(19.8 = 2\pi \times 1.5 \times 2.1\)
Alternative
OR \(2\pi \times 19.8 \times 2.1\) M1, 261(.3..) A1