摘要：3．在下面点子图上画一个平行四边形和一个梯形.再画出它们的高. ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
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按要求在下面方格纸上画图形．（每个小方格表示1平方厘米）（1）按2：1的比例画出三角形放大后的图形．
（2）画出房子图的另一半，使它成为一个轴对称图形．
（3）将平行四边形绕A点逆时针方向旋转90°，画出旋转后的图形．
按要求在下面方格纸上画图形．（每个小方格表示1平方厘米）