Page 134 - Math Genius C4

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\ 30-Sep-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

Step 2: Place the ruler along the point A. Remember to adjust the ‘0’ of the ruler at 4. Look at the given figure and write the name of: Q
point A, and hold it firmly. (a) Any three points. (b) Any two line segments. P
A R
(c) Any three rays. (d) A line.

5. Measure the length of the following line segments using a ruler. X Y

(a) C D

Step 3: Mark a point, say B, at 6 cm along the edge of the ruler. (b) P Q
Step 4: Then, join the point A to B by drawing a line segment. (c) R S

A 6 cm B (d) T U

6. Draw the following line segments of given lengths.

(a) AB = 4 cm (b) CD = 8 cm (c) EF = 10 cm

tyPes of Lines
Thus, AB is the line segment having the required A 6 cm B
length, i.e., 6 cm. A straight line can be drawn in the following ways.

Practice time 7a (a) a horizontal line

(b) a vertical line
1. Fill in the blanks.

(a) A ______________ has no length, breadth or height. (c) a slanting line Horizontal line Vertical line Slanting line

(b) A line segment has ____________ length. A pair of lines lying on a plane either meet at a Be Aware
(c) A ray can extend in ____________ direction. point or never meet each other. On this basis, A plane can be
considered as a
(d) A line has _______________ end point(s). they are known as intersecting and parallel lines. flat surface that

2. Identify each of the following figures and write the name using symbols. Intersecting Lines: A pair of lines which meet or extends indefinitely
in all directions. The
V intersect at one point are called intersecting sheet of paper is a part of a plane.
T lines.
(a) P (b) (c) D C (d)
The point at which the lines meet or intersect is called the point of intersection. l m
S In the given figure, O is the point of intersection of lines l and m.

U O
3. Name all the rays in the following figures. Parallel Lines: A pair of lines that can never meet even if extended in both

(a) B (b) H (c) A P B directions endlessly are called parallel lines. p

G A In the given figure, p and q are parallel lines. q
C
A O F C D
O B H G Think Tank Logical Thinking
D E F Where do you see parallel lines around you? Write in the given blank space.
D C ________________ ________________ ________________ ________________
E

132 Mathematics-4