What additional information is needed to prove the triangles are congruent by hl?

To prove hl, the hypotenuse, a side, and a right angle need to be marked congruent. 

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.