5. (10 points) As shown in the figure, the side length of the large square is 14, and the side length of the small square is 10. The sum of the areas of the shaded parts is ( )
A. 25
B. 40
C. 49
D. 50
5. (10 points) As shown in the figure, the side length of the large square is 14, and the side length of the small square is 10. The sum of the areas of the shaded parts is ( )
【Solution】Solution: According to the analysis, as shown in the following figure, Figure (1) is rotated counterclockwise by $90^{\circ}$,
the shaded parts can be combined to form an isosceles right triangle, $S=14^{2} \div 4=49$
A. 25
B. 40
C. 49
D. 50

Therefore, the correct answer is: $C$.