As shown in the figure on the right, the area of blank part is 24 square centimeters, the area of shadow part a is 5 square centimeters, so the area of shadow part B is () square centimeters?

As shown in the figure on the right, the area of blank part is 24 square centimeters, the area of shadow part a is 5 square centimeters, so the area of shadow part B is () square centimeters?

19 square centimeters