Which of the following is a valid reason for stating that < 1 ~ < 2? look at the two pictures

When two lines intersect and they make a 90 degrees angle between them, then those lines are said to be perpendicular to each-other and all four angles between them are 90 degrees each.

In the given diagram we can see that two lines are intersecting and angle ∠2 is marked as 90 degrees. It means these two lines are perpendicular to each other and all angles would be Right angles i.e. 90 degrees each.

Hence ∠1 ≅ ∠2 = 90°

Hence, option B is correct.

  or  

sin y = 7/q

7 is the opposite side length, q is the hypotenuse

tan y = 7/r

7 is the opposite side length, r is the adjacent side length

using sohcahtoa ^^^^

cos y = adjacent/hypotenuse

cos y = r/q