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**What is angle; measure of an angle; sense of an angle ; right angle ?**

**Explain Quadrants ; Angle in standard position ; Angle in quadrant ;Quadrant angle triangle of reference coterminal angles with graph ?**

**The 3 type of System for measuring angles (1) Sexagesimal System (2) Centesimal System (3) Circular System**

**Theorem 1: Radian is a constant angle**

**Theorem 2 : The no. of Radians in an angle subtended by an arc of a circle at the centre = arc/radius**

**What is the Relation between radians and degrees ?**

**Some important points (1) The angle between two consecutive digits in a clock is `30^@` (2) The hour hand rotates through an angle of `30@` in one hour. (3) The minute hand rotates through an angle of `6^@` in one minute.**

**Find the degree measure corresponding to following radian measures : `(i) (2pi/15)^c (ii) (pi/8)^c (iii) -2^c`**

**Find the radian measures corresponding to following degree measures (i) `340^@ (ii) 75^@ (iii) -37^@30' (iv) 5^@37'30''`**

**Relation between three system of measurement :: Refer-Transformation Formula**