**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 90^{o}

(b) at 6 O’ clock the angle between two hands is 180^{o}

(c) Each jour consist of the angle of = 180^{o} / 6 = 30^{o}

∴ At 7:00 pm the angle between two hands is 30^{o} x 5

= 150^{o}

Small mistake