Page 128 - Fun with Mathematics 2

Cone

Objects that resemble a cone are an ice cream Vertex

cone, funnel, conical tent, clown’s cap and
birthday cap. Curved
surface
Properties of a cone:

A cone has 1 plane surface, which is the base of Edge
l Plane
the cone. surface

It has 1 curved surface.
l
It has 1 vertex.
l
It has 1 circular edge where the curved face meets the plane face.
l

Let us summarise:
This table will help you revise the properties of each of the solid shapes.

Solid shapes Vertex Edge Plane surface Curved surface

Cuboid 8 12 6 0

Cube 8 12 6 0

Cylinder 0 2 2 1

Sphere 0 0 0 1

Cone 1 1 1 1

4
Write True/False.
(a) A cricket ball has a curved surface. ___________

(b) The top of a book is a plane surface. ___________

(c) The bottom of a brick is a curved surface. ___________

(d) All the faces of a cube are identical. ___________

(e) A sphere has no curved face. ___________

(f) An apple has a curved surface. ___________

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