# 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