Related rates problem involving angles A picture 4ft high is placed on a wall with its base 3ft. above the eye of an observer. If the observer is approaching the wall at the rate of 4ft/sec, how fast is the measure of the angle subtended at his eye by the picture increasing when he is 10 ft. from the wall? I am having trouble visualizing this problem, if someone could help me draw this picture I might be able to get started. I'll ask any further questions if I need assistance after that. thanks

The base of a triangle is the vertical dimension of the picture. The apex is the eye. You are not given the height of the eye, but I believe it is intended to be $5.5$ feet, which makes the triangle isosceles. The altitude is $10$ feet and decreasing.