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1 北京卷题 18 如图 1,在多面体ＡＢＣＤ—Ａ1Ｂ1Ｃ1Ｄ1中 ,上、下底面平行且均矩形 ,相对的侧面与同一底面所成的二面角大小相等 ,侧棱延长后相交于Ｅ、Ｆ两点 ,上、下底面矩形的长、宽分别为ｃ ,ｄ与ａ ,ｂ ,且ａ ｃ,ｂ ｄ ,两底面间的距离为ｈ . 求侧面ＡＢＢ1Ａ1与底面
1 Beijing Volume 18 As shown in Figure 1, in the polyhedron ABCD-A1B1C1D1, the upper and lower bottom surfaces are parallel and rectangular. The dihedral angle formed by the opposite side and the same bottom surface is the same, and the side edges extend after intersecting at E and F. Point, the length and width of the upper and lower bottom rectangles are c, d and a, b, and a c, b d, and the distance between the two bottom surfaces is h. Find the side ABB1A1 and the bottom surface.