Good examples build confidence

The key to solving math problems can be by analyzing examples. Don't rush to see a solution to a problem you got wrong. Instead, use an example to determine your mistake. You'll learn much more that way and build confidence. For example, check out the following example and try to answer this question.
Question
If you have a right triangle that has the longest side being 8 inches, and another side that is 5 inches long, what is the length of the third side? (..answer: 6.25 inches...see if you can get the same answer)
Example
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