# Home / Arithmetic Aptitude / Trigonometry :: Section-1

### Arithmetic Aptitude :: Trigonometry

1.  For Cosine Rule of any triangle ABC, b² is equal to

2.  A. a² - c² 4bc cos A B. a² + c² - 2ac cos B C. a² - c² + 2ab cos A D. a³ + c³ - 3ab cos A   3.  For Cosine Rule of any triangle ABC, c² is equal to

4.  A. a² - b² + 2ab sin A B. a² + b² + 2ab cos A C. a² + b² - 2ab cos C D. c² + a² + 2ac cos C   5.  In a triangle ABC, if angle A = 72° , angle B = 48° and c = 9 cm then Ĉ is

6.  A. 60° B. 63° C. 66° D. 69°   7.  Considering Cosine Rule of any triangle ABC, possible measures of angle A includes

8.  A. angle A is acute B. angle A is obtuse C. angle A is right-angle D. all of above   9.  Sine rule for a triangle states that

10.  A. a/sin A = b/sin B = c/sin C B. sin A/a = sin B/b = sin C/c C. a/sin A + b/sin B + c/sin C D. 2a/sin A = 2b/sin B = 2c/sin C   11.  Dimensions of plane includes

12.  A. length only B. breadth only C. depth and length D. breadth and length   13.  By expressing sin 170° in terms of trigonometrical ratios, answer will be

14.  A. sin 10° = 0.1631 B. sin 10° = 0.1736 C. sin 10° = 0.3761 D. sin 10° = 1.7362   15.  By expressing sin 125° in terms of trigonometrical ratios, answer will be

16.  A. sin 55° = 0.8192 B. sin 65° = 0.9128 C. sin 70° = 0.5384 D. sin 72° = 0.1982   17.  By expressing cos 113° in terms of trigonometrical ratios, answer will be

18.  A. − cos 62° = -0.8520 B. − cos 65° = -0.4258 C. − cos 67° = -0.3907 D. − cos 76° = -0.7093   19.  For Cosine Rule of any triangle ABC, a² is equal to

20.  A. b² + a² - 2ac cos A B. b² + c² - 2bc cos A C. b² - c² + 3bc cos C D. b³ + c³ - 2bc cos B   