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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;
(2)在圖乙中畫一個平行四邊形,使它的周長不是整數.(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生的動手操作能力,另一方面考查了學生的空間想象能力,重視知識的發生過程,讓學生體驗學習的過程.
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