Page 145 - Maths Class 04
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Faces, Edges and Vertices of a Solid Figure
A solid figure can be defined by the number and combination of certain
parts. These parts are:
« Faces « Edges « Vertices
These three parts are relevant to any solid that has flat surfaces, places
where flat surfaces intersect and places where planes intersect.
Face : A face is any flat surface. The flat surface that Vertex
makes the front of this cube is called a face . Many
solid figures have more than one face.
Edge : An edge is the line segment where two faces
meet. Many solid figures have more than one edge. Face
Vertex : A vertex is a point where several planes meet
in a point. Many solids have more than one vertex or
Edge
many vertices.
Look at some more shapes given below having many faces, edges and
vertices.
Curved face Flat face
Edge
Curved
face Edges
Flat faces Curved
face
Cylinder Corner
Sphere Cone
« A cylinder has 3 faces (2 flat, 1 curved), 2 edges and 0 corners.
« A sphere has only 1 curved face.
« A cone has 2 faces (1 flat, 1 curved), 1 edge and 1 corner.
Mathematics-4 145
