Page 132 - Math Genius C4

E:\Working\Orange_Education\Math_Genius_4\Open_Files\Chap-07
\ 30-Sep-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

w

1. Identify the shape and fill in the blanks.

(a) A solid with one curved face, 1 flat face and 1 corner is a _____________.

(b) A solid with 12 edges and 6 rectangular faces is a _____________.

(c) A 2-dimensional shape without any edges is a _____________.

2. Draw the front, side and top views of the given objects.

(a) (b) (c)

Basics of Geometry

Let us recall the basic concept of

geometry learnt in the previous class. Knowledge Desk

Point The word ‘Geometry’ is derived from
the Greek words ‘Geo’, meaning ‘Earth’
A small dot made with a sharp pencil and ‘Metron’ meaning ‘Measurement’.
Thus, the word ‘Geometry’ means ‘Earth’s
or a pen on paper, the tip of a needle, measurement’.

etc., represent a point.
A point shows an exact location.

It has no length, breadth or thickness. Q

A point is denoted by a capital letter.

For example: Q, P and A are points. P A

Line

A straight path which goes in two opposite directions indefinitely is called a line.

Thus, a line has no end point. To name a given line, we consider any two points lying
on it.

For example: If A and B are any two points on a line, we A B
call it ‘line AB’ and the line is denoted by AB .

ray

A ray is a part of a line which goes on only in one A B
direction. A ray has one end point. For example, in the
given figure, AB is a ray which can be written as AB , where A is its initial

point. The sun’s rays are an example of rays.

130 Mathematics-4