2. A cube whose edge is 21 cm long has a circle
of diameter 21 cm on each of its faces painted
black. What is the total area of the unpainted
surface of the cube?
Answers
Answered by
12
Total unpainted area=TSA of cube - 6( area of circle)
=> 6(s)^2-6(πr^2)
s=21 and r=10.5
Total unpainted area=2,646-2077.11
=568.89 cm^2
Answered by
3
Remaining area= Area of square- Area of circle
= s2-Pie r2
= 21^2- 22/7 *21/2*21/2
=441- 33*21/2
= 441-693/2
= 882-693/2
= 289/2
= 94.5 cm2
Therefore, Area unpainted= 6s2
=6*94.5
=567cm2
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