The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6 75 cm ...........

Quantitative Aptitude (CGL) Mensuration 3D

The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6.75 cm and 5.25 cm respectively. If it is melted to form a solid cylinder of height half of the orignal cylinder, then the radius of the solid cylinder is

6 cm

6.5 cm

7 cm

7.25 cm

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Explanation:

=πr²₁h−πr³₂h
=πh(r₁²r₂²)
=πh(r₁+r₂)()r₁−r₂
=22/7×15×(6.75+5.25)(6.75−5.25)
=22/7×15×12×1.5
Vol.=πr₃²=22/7×15×12×1.5
r₃²×15/2=15×12×1.5
r₃=6

By: MIRZA SADDAM HUSSAIN

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The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6 75 cm ...........

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Explanation:

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