1. (a) a = 37° ( s on same arc are equal) b = 61° ( s on same arc are equal) (b) c = 43° (alternate angles, parallel lines) d = 43°( s on same arc are equal) e = 43° ( s on same arc are equal) (c) f = 62° ( at centre = 2 × at circumference) g = 62° ( s on same arc are equal) (d) h = 110°( at centre = 2 × at circumference) i = 250° ( s at a point add to 360°) j = 125° ( at centre = 2 × at circumference) (e) k = 96° ( at centre = 2 × at circumference) l = 42°( sum of isos. ) m = 84°(adjacent s on st.line are supp.) n = 90° ( in semi-circle is 90°) (f) p = 57° ( s on same arc are equal) q = 114° ( at centre = 2 × at circumference) r = 57° (base s of isos. ) s = 57° (base s of isos. ) (g) g = 28° ( between tangent and radius is 90°) h = 124° ( sum of isos. ) i = 62° ( sum of right-angled Æ is 180°) j = 62° (base s of isos. ) (h) t = 60° ( s on same arc are equal) u = 60° (base s of isos. ) v = 30 °( between tangent and radius is 90°) w = 30° ( in semi-circle is 90°) x = 30° ( sum of is 180°)