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1. (b) 360^o (c) 540^o(d) (i) 72^o (ii) 108^o

2. (a) 360^o (b) 900^o

(c) (i) 51.4^o (to 1 d.p.)

(ii) 128.6^o (to 1 d.p.)

3. (a) x = 27^o (b) y = 130^o (c) p = 99^o, q = 112^o

r = 54^o (d) x = 36^o, 3x = 108^o, 4x = 144^o

4. (a) (i) 90^o (ii) 135^o(iii) 150^o (iv) 162^o

(b) The more sides, the larger each interior angle is.

5. 20
6. 12