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一、精心选一选1,下列说法中错误说法的个数是().①一组对边平行,另一组对边相等的四边形是平行四边形:②有一条对角线平分一组对角的平行四边形是菱形:③四个角都是直角的四边形是正方形;④对角线相等的四边形是等腰梯形.A.1 B.2 C.3 D.42.已知平行四边形的一条边长为14 cm.则下列长度的线段中可分别作为它的两条对角线的是().A.10 cm与16 cm B.12 cm与16 cmC.10 cm与40 cm D.20 cm与22 cm3.根据下列条件,不能确定菱形的形状和大小的是().
First, choose a carefully selected 1, the following statement in the wrong argument is the number of (). ① a group of parallel to the other side of the group is equal to a quadrilateral parallelogram: ② a diagonal bisect a diagonal Parallelogram is a rhombus: (3) the quadrilaterals whose four corners are all right angles are squares, (4) the diagonally equivalent quadrilateral is the isosceles trapezoid.A.1 B.2 C.3 D.42. One side of the known parallelogram The length of the line segment can be used as two diagonal () .A.10 cm and 16 cm B.12 cm and 16 cmC.10 cm and 40 cm D.20 cm With 22 cm3. According to the following conditions, can not determine the shape and size of diamond is ().