## 1.Every section of a sphere by a plane is a-… 2.The portion of a right circular cone interested between two parallel planes i

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Answer:1.All cross sections of a sphere are circles. (All circles are similar to one another.) If two planes are equidistant from the center of a sphere, and intersecting the sphere, the intersected circles are congruent. A great circle is the largest circle that can be drawn on a sphere.

2.We know that, if a cone is cut by a plane parallel to the base of the cone, then the portion between the plane and base is called the frustum of the cone.