For any acute angle, sine A is equal to

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

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

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°

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

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