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Q.

What are the boundaries of the solids?


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a

Line

b

Curves

c

Points 

d

Surfaces

answer is C.

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Detailed Solution

Using the theorem of ‘Euclidean geometry.
According to Euclidean geometry,
Solids are 3-dimensional figures but their surfaces are 2-dimensional.
Therefore, the boundaries of solids are surfaces.
Hence, option 3 is correct.
 
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