Referring to the triangle ABC below, the ratio of: adjacent side / hypotenuse side, for angle A, is called the:
A. Sine of angle A or Sin A
B. Cosine of angle A or Cos A
C. Secant of angle A or Sec A
D. Tangent of angle A or Tan A
E. Cotangent of angle A or Cot A.
Answer: B