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1) For the Cosine Rule of any triangle ABC, the b² is equal to a. a² - c² + 2ab cos A b. a³ + c³ - 3ab cos A c. a² + c² - 2ac cos B d. a² - c² 4bc cos A
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2) For the Cosine Rule of any triangle ABC, the c² is equal to a. c² + a² + 2ac cos C b. a² + b² - 2ab cos C c. a² + b² + 2ab cos A d. a² - b² + 2ab sin A
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3) In a triangle ABC, if angle A = 72° , angle B = 48° and c = 9 cm then the Ĉ is a. 69° b. 66° c. 60° d. 63°
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4) Considering The Cosine Rule of any triangle ABC, the possible measures of angle A includes a. angle A is obtuse b. angle A is acute c. angle A is right-angle d. all of above
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5) The sine rule for a triangle states that 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
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6) By expressing the sin 125° in terms of trigonometrical ratios, the answer will be a. sin 65° = 0.9128 b. sin 55° = 0.8192 c. sin 70° = 0.5384 d. sin 72° = 0.1982
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7) By expressing the cos 113° in terms of trigonometrical ratios, the answer will be a. − cos 76° = -0.7093 b. − cos 65° = -0.4258 c. − cos 67° = -0.3907 d. − cos 62° = -0.8520
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8) For the Cosine Rule of any triangle ABC, the a² is equal to a. b² + c² - 2bc cos A b. b² + a² - 2ac cos A c. b³ + c³ - 2bc cos B d. b² - c² + 3bc cos C
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9) The Cosine Rule is also known as a. Sine triangle b. Cosine Formula c. Cosine Triangle d. Cosine Area
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10) If the sine is 0.896 then the value of acute angle is a. 78° b. 72° c. 63.64° d. 65°
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