Answer
x° = 30.6°
Step-by-step explanation
In a right-angle triangle, the side opposite the right angle is the Hypotenuse, the side opposite the given angle that is non-right angle is the Opposite and the remaining side is the Adjacent.
For this question,
Hypotenuse = 36
Opp = ?
Adjacent = 31
Angle = x°
Using trignometric identities
Cos x° = (Adj/Hyp)
Cos x° = (31/36)
Cos x° = 0.8611
x° = Cos⁻¹ (0.8611)
x° = 30.6°
Hope this Helps!!!