To determine Launch Angle (for real)
You need to know the Distance to Screen (inches)
You need to know the Height of the ball impact (inches)

Example:

Enter this in Google:
atan(38/138) in degrees

You need to specify “degrees” otherwise you will get the result in radians.

In this Example:

• “38” is the Height of the Impact point of the ball on screen in inches.
• “138” is the distance of the ball from screen in inches.