Concave: It is the curved like a segment that lies in the interior of the circle or hollow sphere and bent outwards. Convex: It is a curved like a segment that is rounded outwards like the exterior of a sphere of the circle.

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Chapter 11, Problem 11CRP

Program Plan Intro

Concave:

It is the curved like a segment that lies in the interior of the circle or hollow sphere and bent outwards.

Convex:

It is a curved like a segment that is rounded outwards like the exterior of a sphere of the circle.

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