Page 95 - Revised Maths Wisdom Class - 6

Lines and Angles 93

Perpendicular
lines

Perpendicular
lines
Table Door

ILLUSTRATIONS
Example 1: Identify and name the following in the figure given. B
(a) all points of intersection (b) a pair of parallel lines

(c) all pairs of intersecting lines A
D
Solution: (a) Point A is the point of intersection of lines AD, AB and AC. C

Point C is the point of intersection of lines AC and CD

Point D is the point of intersection of lines AD and CD

(b) AB || CD

(c) AD and AC, AD and CD, AB and AC, AB and AD are pairs of intersecting lines.

Example 2: Name all the rays and their corresponding initial points in the figure given. A
B
Solution: Ray OA, OB, OC, OD, OE with initial point O.
O C
D
E

Exercise 6A
Exercise 6A
1. Fill in the blanks.
(a) A dot gives us the idea of a ___________.

(b) A tabletop gives an idea of a ___________.
(c) Two lines lying in a plane are ___________ if they do not intersect each other.
(d) Five points are ___________ if they all lie on a line. D C
2. Write the name of all the points, line segments and planes in the given figure.

3. How many lines can be drawn through a point? A B
4. How many lines can be drawn through two given distinct points? H G
5. Name all the line segments in each of the following figures.
E F

(a) (b) (c)