Ans (i) 30° (ii) 117° (iii) 45° (iv) 22.5°
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all the answers are correct
(i)90-60=30°
(ii)180-63=117°
(iii)180-90=2a
a=90/2=45°
(iv)3a+2a+3a=180°
8a=180
a=180/8
a=22.5°
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