What is the length of the missing leg?

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

If the basis of an isosceles trapezoid have lengths of 11 and 26, what is the length of the median?