该图形由一个半径为 5 cm 的半圆和一个三角形组成。三角形的三条边长分别为 4 cm、3 cm 和 5 cm。求阴影部分的周长。（取 $\pi = 3.14$） 答：___ cm

1. Calculate the length of the semicircular arc.

$\text{Arc length} = \frac{1}{2} \times \pi \times d = \frac{1}{2} \times 3.14 \times (2 \times 5) = 15.7 \text{ cm}$

2. Identify the straight edges forming the perimeter of the shaded part.

The straight edges of the shaded part are the right half of the diameter ($5 \text{ cm}$) and the two sides of the triangle that lie inside the semicircle ($4 \text{ cm}$ and $3 \text{ cm}$).

3. Calculate the total perimeter of the shaded part.

$\text{Perimeter} = 15.7 + 5 + 4 + 3 = 27.7 \text{ cm}$