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

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

A.

circle

B.

frustum of a cone

C.

sphere

D.

hemisphere

Correct option is A

Given:
A right circular cone is cut by a plane parallel to its base.
Concept used (if any):
When a plane cuts a cone parallel to its base, the section obtained is similar and parallel to the base.
The base of a right circular cone is a circle.
Solution:
The base of the cone is circular.
A plane parallel to the base will intersect the cone in a smaller, similar circular shape.
Correct answer is (a) circle

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