draw(0.3,-3) coordinate(A) arc [radius=4.7, start angle=180, end angle=225] coordinate(B);

 draw(9.7,-3) coordinate(D) arc [radius=4.7, start angle=360, end angle=315] coordinate(C);

 filldraw[fill=red, draw=red] (A) arc [radius=4.7, start angle=180, end angle=225] -- (C) arc [radius=4.7, start angle=315, end angle=360] --(A);