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一、填空题 a)己知一个多边形的各个内角都相等,且每个内角与一个外角度数之比为4:1,则这个多边形是__边形,它有__条对角线. b)己知平行四边形ABCD的对角线AC和BD相交于点O,如果△AOB的面积是3,则S平行四边形ABCD=____. c)若平行四边形的一边长为8cm,一条对角线的长为6cm,则另一条对角线的长的取值范围是 d)己知菱形的两条对角线长分别为6和8, 则它的边长是____. e) 矩形的两条对角线的夹角为60°,一条对角线与短边的和为15cm.则短边的长是
Filling in the blanks a) It is known that the interior angles of a polygon are all equal, and the ratio of each interior angle to an exterior angle is 4:1. The polygon is __edge, and it has __ diagonal. b) It is known that the diagonals AC and BD of the parallelogram ABCD intersect at the point O. If the area of the ΔAOB is 3, the S parallelogram ABCD=____. c) If the side length of the parallelogram is 8 cm, a diagonal line For a length of 6cm, the long diagonal of the other diagonal is d) The length of the two diagonals of the known diamond is 6 and 8, respectively, and the length of its side is ____. e) Two of the rectangles The diagonal angle is 60°, and the sum of diagonal and short sides is 15cm. The length of the short side is