What does the dashed part of the figure represent

What is the measure of angle tvu shown in the diagram below

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

The area of the map is the product of the length and width. write and expression for the area as the product of the two binomials do not multiply