1. (b) 360o (c) 540o(d) (i) 72o (ii) 108o 2. (a) 360o (b) 900o (c) (i) 51.4o (to 1 d.p.) (ii) 128.6o (to 1 d.p.) 3. (a) x = 27o (b) y = 130o (c) p = 99o, q = 112o r = 54o (d) x = 36o, 3x = 108o, 4x = 144o 4. (a) (i) 90o (ii) 135o(iii) 150o (iv) 162o (b) The more sides, the larger each interior angle is. 5. 20 |