boondoggle is a scheme intended to fool (i.e. bamboozle, hornswoggle, hoodwink - other words you may have heard which are very similar in meaning) people into believing that all is well, that a dire situation is in fact under control. In this vein, the term government boondoggle is rather redundant.
If you are a visual learner, you learn by reading or seeing pictures. You understand and remember things by sight. You can picture what you are learning in your head, and you learn best by using methods that are primarily visual. You like to see what you are learning.
This Math quiz is called 'Measurements - Height, Length, Width and Depth' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.