Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Mensuration Solid Figures
A hollow metallic pipe with an external radius of 41 cm and thickness of 1 cm is melted and recast to form a cylinder of length equal to the length of the pipe. The radius of the cylinder will be.
1
6 cm
2
7 cm
3
8 cm
4
9 cm
5
None of the above