A4-foot tall person standing with her back to the sun casts an 6-foot long shadow. to the nearest degree, what angle does the sun make with the ground?

For this case we have the following trigonometric relationship:
 Tan (x) = (4/6)
 Clearing the angle we have:
 x = Atan (4/6)
 x = 33.69006753
 Rounding off we have:
 x = 34 degrees
 
 The angle that sun makes with the ground is:
 x = 34 degrees