A single di has 6 sides, meaning the probability of rolling a 6 is 1/6. So if you roll a di 18 times you would probably get 6 three times. Meaning the number of unsuccesful rolls would be (18/18 - 3/18). Hope this helps.
All triangles in the given figure are similar, from SAS. Notice that marked in the diagram, .
For triangle was base , leg contains three of these marked segments. In triangle with base , leg has two of these marked segments. By definition, similar polygons have corresponding sides in a constant proportion. Therefore, the length of GF must be the length of EH. Since the length of EH is given as 48, we have: