9. (5 points) The figure below consists of two circles with a diameter of 2 and four isosceles right triangles with legs of length 2. The area of the shaded part in the figure is $\qquad$. $(\pi=3)$
【Solution】Solution: As shown in the figure above, according to the analysis, we get,
The area of the large isosceles triangle is: $2 \times(2 \times 2) \div 2=4$, the area of the semicircle is: $3 \times(2 \div 2)^{2} \div 2=1.5$, the area of the small isosceles triangle is: $2 \times(2 \div 2) \div 2=1$, the area of the segment is: $1.5-1=0.5$, the total shaded area is: $4+0.5=4.5$, Answer: The shaded area in the figure is 4.5. Therefore, the answer is: 4.5.