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1 . For Cosine Rule of any triangle ABC, b² is equal to
A. a² - c² 4bc cos A
B. a² + c² - 2ac cos B
C. a² - c² + 2ab cos A
D. a³ + c³ - 3ab cos A

2 . For Cosine Rule of any triangle ABC, c² is equal to
A. a² - b² + 2ab sin A
B. a² + b² + 2ab cos A
C. a² + b² - 2ab cos C
D. c² + a² + 2ac cos C

3 . In a triangle ABC, if angle A = 72° , angle B = 48° and c = 9 cm then Ĉ is
A. 60°
B. 63°
C. 66° D. 69°

4 . Considering Cosine Rule of any triangle ABC, possible measures of angle A includes
A. angle A is acute
B. angle A is obtuse
C. angle A is right-angle
D. all of above

5 . 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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