A sphere is a perfectly symmetrical geometrical object. In non-mathematical usage, the term is used to refer either to a round ball or to its two-dimensional surface. In mathematics, a sphere is the set of all points in three-dimensional space (R3) which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. The fixed point is called the center or centre, and is not part of the sphere itself. The special case of r = 1 is called a unit sphere.
Surface Area and Volume of a Cone
A cone is a three-dimensional geometric shape bounded by a simply connected region of a plane (the base) and a surface (the lateral surface) described by the locus of all line segments joining the perimeter of the base to a point (the apex or vertex) lying off the plane of the base. In common usage in elementary geometry, "cone" usually means a right circular cone (see below).
Surface Area and Volume of a Cylinder
Surface Area and Volume of a Rectangular Prism
In geometry, an n-sided prism is a polyhedron made of an n-sided polygonal base, a translated copy, and n faces joining corresponding sides. Thus these joining faces are parallelograms. All cross-sections parallel to the base faces are the same. A prism is a subclass of the prismatoids.
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what is the basic of a sphere?
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