1.(a) AB
(b) CB, AC or AB
(c) CB
(d) EF
(e) OA, OC or OB
2. (a) and (b) 
(c) A, B, C and D
(d) Any circle, centre O
3. (a) 
RQS (b) RQ (c) SP and PQ, RQ and RS
(d) 
RSQ
4. (a) a = 90°, b = 67.4°, c = 22.6°
5. (a) a = 53°, b = 53°
(b) c = 48°, d = 48°, e = 120°, f = 30°
(c) g = 31°, h = 90°, i = 59°, j = 59°, k = 90°
(d) m = 98°, n = 155°, p = 73°
6. (a) q = 53°, r = 53°, s = 37°, t = 53°, u = 53°, v = 37°
(b) OXW (c)OXY and XYZ
