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Q.

In a right circular cone, the cross-section made by a plane parallel to the base is a


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a

circle

b

frustum of a cone

c

sphere

d

hemisphere 

answer is A.

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Detailed Solution

Given a right circular cone.
When we cut or slice a cone with a plane parallel to its base and then remove the cone. The left-over part is called a frustum of the cone.
The cross-section thus formed will be a circle.
Question ImageThus, in a right circular cone, the cross-section made by a plane parallel to the base is a circle.
Therefore, option (1) is correct.
 
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In a right circular cone, the cross-section made by a plane parallel to the base is a