"The polygons are similar. Solve for the missing piece of the polygon." I am very confused..? does anyone know how to solve this with the steps?

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

We just started the introduction into circles and i have no idea how to do this.

If you could answer these your a life saver