Question

In right ΔMNO, what would be equal to sin M?

  A.  sin O

  B.  cos M   C.  tan M   D.  cos  O

Answer 1

Assuming that N is the 90 degree angle

Sin of M = opposite/hypotenuse
that would be line segment NO/MO
Therefore to match that, Option D. Cos O, makes it equal.
Cos O= adjacent/hypotenuse, which is also line segment NO/MO