What is the approximate measure of angle i in a right triangle with b=20 and c=21.17.7546.443.672.25

First we are going to draw our triangle as you can see in the attached image.
Next, we are going to solve it.
To find angle A, we need a trig function that relates the adjacent side with the hypotenuse. That function is cosine, so:





We can conclude that the measure of angle A is 17.75°.

Now, to find angle B we can use the fact that the sum of the interior angles of a triangle is always 180°:




We can conclude that the measure of angle B is 72.25°.

Could you make it more clear?