Answer:
30.8 degrees
Explanation:
First, find the missing angles on the triangle to the right:
*arccosine(4.5/7) = 49.99
This is the angle between sides 7 and 4.5.
Next, using 49.99 as a reference angle, find the missing side:
tan(49.99) x 4.5 = 5.36
Next, we use arctan to find the missing angle:
*arctan(5.36/9) = 30.7761482323
Or 30.8 degrees.
*A fraction, not division ;-;