Telangana SCERT Solution Class IX (9) Math Chapter 4 Lines and Angles Exercise 4.1
(1) In the given figure, name:
(i) any six points
(ii) any five line segments
(iii) any four rays
(iv) any four lines
(v) any four collinear points
Solution:
(2)
(i) The clock has an obtuse angle
(ii) The wooden structure has a right angle
(iii) The carom board has are acute angle
(3)
(i) True
(ii) True
(iii) False, a ray has one intial point and goes upto infinity.
(iv) False
(v) True
(vi) True
(vii) False
(viii) True
(4.) What is the angle between two hands of a clock when the time in the clock is
(a) 9’O clock (b) 6’O clock (c) 7:00 PM
Solution: (a) at 9 O’ clock the angle between two hands is 90o
(b) at 6 O’ clock the angle between two hands is 180o
(c) Each jour consist of the angle of = 180o / 6 = 30o
∴ At 7:00 pm the angle between two hands is 30o x 5
= 150o
Small mistake