What is the area of this shape

The round part is confusing me.

The standard distance between studs in a house is 1.5 feet. if you have a set of blueprints for a house that mark every 1.5 feet with 2 in., by how many inches will a 13-foot wall be represented?

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area