如图所示,把一张长方形纸片ABCD沿EF折叠,若角EFG=50°,求角DEG和∠BGD'的度数class="ikqb_img" src="http://d.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=c7dd34818cb1cb133e3c3415ed647a76/b7003af33a87e950c65fac0211385343fbf2b410.jpg
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/14 11:16:38
如图所示,把一张长方形纸片ABCD沿EF折叠,若角EFG=50°,求角DEG和∠BGD'的度数class="ikqb_img" src="http://d.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=c7dd34818cb1cb133e3c3415ed647a76/b7003af33a87e950c65fac0211385343fbf2b410.jpg
如图所示,把一张长方形纸片ABCD沿EF折叠,若角EFG=50°,求角DEG和∠BGD'的度数
class="ikqb_img" src="http://d.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=c7dd34818cb1cb133e3c3415ed647a76/b7003af33a87e950c65fac0211385343fbf2b410.jpg" esrc="http://d.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=fa56b70a574e9258a6618eeaa9b2fd6e/b7003af33a87e950c65fac0211385343fbf2b410.jpg" />
如图所示,把一张长方形纸片ABCD沿EF折叠,若角EFG=50°,求角DEG和∠BGD'的度数class="ikqb_img" src="http://d.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=c7dd34818cb1cb133e3c3415ed647a76/b7003af33a87e950c65fac0211385343fbf2b410.jpg
由于是沿EF折叠
所以:∠DEF=∠D'EF,∠CFH=∠C'FH
由平行知:∠DEF=∠D'EF=∠CFH=∠C'FH=50°
所以:∠BGD'=∠BFC'=80°
∠DEG=100°