The diameter and the height of a right circular cylinder are 11 2 cm and 21 cm respectively The meta...........

Quantitative Aptitude ( CCS) Mensuration 3D

The diameter and the height of a right circular cylinder are 11.2 cm and 21 cm respectively. The metal around its outer body is 0.4 cm thick. What is the volume of the metal?

186.34 cm³

306.24 cm³

156.56 cm³

336.24 cm³

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Explanation:

Answer & Explanation
306.24 cm³
Explanation:
Internal radius = (11.2)/2 = 5.6, so outer radius = 5.6+0.4 = 6cm
So volume of metal = (22/7)*62*21 – (22/7)*(5.6)2*21 = (22/7)*[62 – (5.6)2]*21 = 306.24cm³