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Class 9Class 10First YearSecond Year
$3. Fill in the blanks(i) \pi radians = (ii) The terminal side of angle 235^{\circ} lies in(iii) Terminal side of the angle -30^{\circ} lies in(iv) Area of a circular sector is(v) If r=2 \mathrm{~cm} and \theta=3 radians then area of the circular sector is(vi) The general form of the angle 480^{\circ} is(vii) If \sin \theta=\frac{1}{2} then \theta= (viii) If \theta=300^{\circ} then \sec (-300)^{\circ}= (ix) 1+\cot ^{2} \theta= (x) \operatorname{Sec} \theta-\tan \theta=$

$4. Express the following angles into radians.(viii) 315^{\circ}$

$1. Locate the following angles:(vii) -150^{\circ}$

$Example: Locate each angle in standard position.(iii) -270^{\circ}$

$2. Identify the closest rantal angles between which the following angles lies.(iii) 572^{\circ}$

$In problems 7-24 verify the identities.21. \sin ^{3} \theta=\sin \theta-\sin \theta \cos ^{2} \theta$

$Example 1: A flagpole 17.9 meter high casts a 7 meter shadow Find the angle of elevation of the sun.$