Mathematics
A solid cylinder of radius R cm and height H cm is melted and recast into smaller identical solid cylinders of height h cm and radius r cm. The number of smaller solid cylinders obtained is : 1. 2. 3. R<sup>2</sup>H ÷ r<sup>2</sup>h<sup>2</sup> 4.
Related Questions
The curved area of a solid cylinder is S cm2 and the circumference of its base is C cm; the height of the cylinder is :
C × S
C + S
S ÷ C
S - C
The total surface area of an open pipe of length H cm, external radius R cm and internal radius r cm, is :
πR2 - πr2 + 2π(R - r)H
2πR2 - 2πr2 + 2πRH
2πRH - 2πrh + πR2 - πr2
2(πR2 - πr2) + 2πRH + 2πrH
The inner radius of a pipe is 2.1 cm. How much water can 12 m of this pipe hold ?