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【329414】《轴对称图形》随堂练习

时间:2025-01-21 13:02:15 作者: 字数:1032字
简介:

2.3 轴对称图形

1.如图,试画出⊙O关于 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 的轴对称的图形.

 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>


2.如图,已知牧马营地在M处,每天牧马人要赶着马群先到河边饮水,再到草地吃草,然后回到营地,试设计出最短的放牧路线.

 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>


3.如图(1),(2)分别为6×6正方形网络上的两个轴对称图形(阴影部分)其面积分别为 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> (网格中最小的正方形面积为一个平方单位).请你观察图形并解答下列问题.

 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>

1 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 的值为多少?

2)请在图(3)网络上画一个面积为10个平方单位的轴对称图形.




参考答案

1.提示:过O点作 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 的垂线交 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>A点,截取 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> ,以 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 为圆心,以圆O的半径为半径画圆 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 即是所示.

2.提示:以河为对称轴作M的对称点 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> ,(如答图)过 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a> 作草地的垂线,垂线和河的交点H就是所求的点.

 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>

3.(1911.(2)如图.

 <a href="/tags/42/" title="图形" class="c1" target="_blank">图形</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/249/" title="对称" class="c1" target="_blank">对称</a> <a href="/tags/849/" title="轴对称" class="c1" target="_blank">轴对称</a>