在所給的9×9方格中，每個小正方形的邊長都是1．按要求畫平行四邊形，使它的四個頂點以及對角線交點都在方格的頂點上．
（1）在圖甲中畫一個平行四邊形，使它的周長是整數(shù)；
（2）在圖乙中畫一個平行四邊形，使它的周長不是整數(shù)．（注：圖甲、圖乙在答題紙上）
【答案】分析：（1）作邊長為2，4的矩形即可；
（2）作邊長為3，的矩形即可．
解答：解：（1）（2）：

點評：本題一方面考查了學(xué)生的動手操作能力，另一方面考查了學(xué)生的空間想象能力，重視知識的發(fā)生過程，讓學(xué)生體驗學(xué)習(xí)的過程．
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