For Cosine Rule of any triangle ABC, a² is equal to
A). b² + a² - 2ac cos A
B). b² + c² - 2bc cos A
C). b² - c² + 3bc cos C
D). b³ + c³ - 2bc cos B
By expressing cos 113° in terms of trigonometrical ratios, answer will be
A). cos 62° = -0.8520
B). cos 65° = -0.4258
C). cos 67° = -0.3907
D). cos 76° = -0.7093
By expressing sin 125° in terms of trigonometrical ratios, answer will be
A). sin 55° = 0.8192
B). sin 65° = 0.9128
C). sin 70° = 0.5384
D). sin 72° = 0.1982
By expressing sin 170° in terms of trigonometrical ratios, answer will be
A). sin 10° = 0.1631
B). sin 10° = 0.1736
C). sin 10° = 0.3761
D). sin 10° = 1.7362
Dimensions of plane includes
A). length only
B). breadth only
C). depth and length
D). breadth and length