# Class 11 Maths Trigonometric Functions L2

You have to be at your strongest when you’re feeling at your weakest.

# Lecture - 2 Chapter 3 Trigonometric Functions

 NCERT Exercise 3.1

2. Find the degree measures corresponding to the following radian measures $\left ( \text{ use } \pi = \frac{22}{7} \right )$
(i) $\frac{11}{6}$
(ii) $-4$
(iiii) $\frac{5\pi}{3}$
(iv) $\frac{7\pi}{6}$

3. A wheel makes 360 revolutions in one minute. Through how many radians does it turn in one second?

4. Find the degree measure of the angle subtended at the centre of a circle of radius 100 cm by an arc of length 22 cm $\left ( \text{ use } \pi = \frac{22}{7} \right )$ .

5. In a circle of diameter 40 cm, the length of a chord is 20 cm. Find the length of minor arc of the chord.

6. If in two circles, arcs of the same length subtend angles 60° and 75° at the centre, find the ratio of their radii.

7. Find the angle in radian through which a pendulum swings if its length is 75 cm and the tip describes an arc of length
(i) 10 cm
(ii) 15 cm
(iii) 21 cm