Measure the sides of the courtyard depicted on the map using your ruler. The courtyard is toward the north end of the Mission Santa Ines complex, surrounded on three sides by buildings and open on the northwestern side.
Calculate the real-world lengths of the sides of the courtyard using the map's scale. Multiply the length you measured in inches by the distance represented by an inch on the map. For instance, if one inch on the map represents 100 feet in real life, multiply the number of inches you measured by 100 feet.
Calculate the perimeter of the courtyard by adding the lengths of all four sides.
Calculate the area of the courtyard by multiplying the length of one side that is oriented east to west with the length of the side that is oriented north to south.