Multiple choice

If the curved surface of a cylinder be doubled the area of the ends, then the ratio of its height and radius is

  1. $2 : 3$
  2. $1 : 1$
  3. $2 : 1$
  4. $1 : 2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Curved surface area = 2*pi*r*h. Area of ends = 2 * (pi*r^2). Given 2*pi*r*h = 2 * (2*pi*r^2), which simplifies to h = 2r. Thus, h/r = 2/1.

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