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Nagaland Class 10 Answered

A circular hole of diameter 7cm is curved out from a cube of side 21cm.find the total surface area and volume of the remaining cube 
Asked by Sennaro3026 | 28 Jan, 2019, 11:41: AM
answered-by-expert Expert Answer
The volume of cube = 213=9261 cu.cm
The circular hole is cut
it forms a cylinder
r =3.5 cm
h = 21 cm
volume = πr2h=808.5 cu.cm
Volume of remaining cube = 9261-808.5=8452.5 cu.cm
Total surface area =TSA cube - 2xcircle + CSA of Cylinder
=6(212)-2π(3.5)2+π(3.5)221
=3377.5 sq cm
Answered by Arun | 28 Jan, 2019, 03:36: PM
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