3. An equilateral triangle with a side length of $60 \mathrm{~cm}$ has 3 identical semicircles inside it. The centers of the 3 semicircles are on the three sides of the equilateral triangle, and the 3 semicircles are pairwise tangent. Then the area of one semicircle in the figure is $\qquad$ $\mathrm{cm}^{2} . \quad(\pi=3.14)$
$471$