Leabhar Iomlán - Cogg

8. (i) 90° (ii) 50° (iii) 50° (iv) 80°9. a 55°, b 90°, c 49°, d 49°, e 67°10. (i) 62° (ii) 44°12. 20°13. (i) 146° (ii) 17°15. (i) Na triantáin XRZ, YQZ agus PYX(ii) 61° (iii) |∠XZY| 61°; |∠ZYX| 61°agus |∠ZXY| 58°16. 68°17. (i) 106° (ii) 74° (iii) 53°18. (i) 48° (ii) 48°20. a 78°, b 39°; x 50°, y 68°; c 63°, d 54°22. (ii) Ní bheadh (b) fíor i gcónaí23. 4 √ ____102 ( 40.4)24. (a) 105.8 cm (b) 122.5 cmCaibidil 4: An ChéimseataChomhordanáideach: An CiorcalTriailcheisteanna 4.11. (i) x 2 y 2 4 (ii) x 2 y 2 25(iii) x 2 y 2 2 (iv) x 2 y 2 18(v) 16x 2 16y 2 9 (vi) 4x 2 4y 2 252. x 2 y 2 253. x 2 y 2 174. (i) (0, 0) (ii) 5 (iii) x 2 y 2 255. x 2 y 2 176. (i) 3 (ii) 1 (iii) 3 √ __3(iv) 5_(v)2_2 37. (i) √ __5 (ii) x 2 y 2 58. x 2 y 2 259. x 2 y 2 1010. x 2 y 2 20; is tadhlaí é tTriailcheisteanna 4.21. (i) (x 3) 2 (y 1) 2 4(ii) (x 1) 2 (y 4) 2 8(iii) (x 4) 2 y 2 12(iv) x 2 (y 5) 2 182. (x 2) 2 (y 2) 2 103. (i) (1, 3)(ii) (x 1) 2 (y 3) 2 84. (i) (3, 2); r 4 (ii) (2, 6); r 2 √ __2(iii) (3, 0); r √ __5 (iv) (0, 2); r √ ___105. (x 2) 2 (y 5) 2 726. (3, 3); (x 3) 2 (y 3) 2 97. (i) (2,4); r 5 (ii) (1, 3); r 5(iii) (4, 0); r 2 √ __6 (iv) (2 1_9_, 3); r (v) (1, 3_ 5_); r 4 4196 Téacs agus Trialacha 4(vi) (0, 31_10. Taobh istigh7_(vi)4(iii) ( 5_2 , 1_2 22 ); r 211. Taobh amuigh12. k 813. (ii) 4 (iii) (x 4) 2 (y 3) 2 1614. (i) 2 (ii) (4, 4)(iii) (x 4) 2 (y 4) 2 4(iv) k 415. (x 4) 2 (y 4) 2 1616. (i) (2, 6)17. (x 2) 2 (y 2) 2 118. (i) A: (7, 1); r 10;B: (3, 1); r 10;C: (2, 1); r 5(ii) (x 7) 2 (y 1) 2 100Triailcheisteanna 4.31. Lárphointe (0, 0); ga √ ___102. (3, 4); r 5 √ __23. Ní tadhlaí é4. (x 1) 2 (y 2) 2 135. (x 2) 2 (y 1) 2 186. (i) (1, 1)(ii) 1(iv) |g| agus |f | cothrom le fad an gha7. (x 2) 2 (y 2) 2 48. (x 2) 2 (y 3) 2 49. (i) (2, 3); r 5 (ii) 31, 1910. (i) 2x 8y 1 0 (ii) 8x 2y 21 0) 2 ( iv) √ ____ 172)2 __ 172 211. x 2 y 2 2x 4y 012. x 2 y 2 6x 8y 013. g 2f 6; 6g 10f c 34;2g 6f c 10; x 2 y 2 4x 4y 2 014. f 0; 3x 2 3y 2 14x 67 015. (i) r 3(ii) k 4; T (2, 0)16. (i) g f agus g, f 0(ii) x 2 y 2 6x 6y 9 017. (ii) 2x 3y 8 0(iii) x 5y 9 0(v) (x 5_2 ) 2 (y 1_(iv) (1, 2); r √ ___13(v) x 2 y 2 2x 4y 8 018. x 2 y 2 8x 12y 27 019. x 2 y 2 10x 10y 30 0;x 2 y 2 2x 2y 18 020. (i) y 1(ii) (x 15) 2 (y 7) 2 36(iii) (x 13) 2 (y 7) 2 36