中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
已知，如图边长为3的正方形ABCD绕点C按顺时针方向旋转30°后得到正方形EFCG，EF交AD于点H，
那么DH的长为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u5peL6L2s55qE5oCn6LSo5b6X4oigQkNGPTMwwrDvvIxDQj1DRj0z77yM4oigRj3iiKBCPTkwwrDvvIzliJnlj6/moLnmja7igJxITOKAneWIpOaWrVJ04pazQ0hG4omMUnTilrNDSETvvIzmiYDku6XiiKBGQ0g94oigRENIPTMwwrDvvIznhLblkI7moLnmja7lkKszMOW6pueahOebtOinkuS4ieinkuW9ouS4iei+ueeahOWFs+ezu+axguinozwvcD4=
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
如图，△ABC以点O为旋转中心，旋转180°后得到△A′B′C′. ED是△ABC的中位线，经旋转后为线段E′D′. 已知BC=4，则E′D′=（ ）
| A: 2 |
| B: 3 |
| C: 4 |
| D: 1.5 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YWI5qC55o2u5Zu+5b2i5peL6L2s5LiN5Y+Y5oCn55qE5oCn6LSo5rGC5Ye6QuKAskPigLLnmoTplb/vvIzlho3moLnmja7kuInop5LlvaLkuK3kvY3nur/lrprnkIbljbPlj6/lvpflh7rnu5Porro8L3A+
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图所示，P是正三角形ABC内一点，且PA=6，PB=8，PC=10. 若将△PAC绕点A逆时针旋转后，得到△P′AB，则点P与点P′之间的距离为（ ）
| A: 4 |
| B: 8 |
| C: 10 |
| D: 6 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+e5o6lUFDigLLvvIznlLHml4vovaznmoTmgKfotKjlj6/nn6XvvIxQ4oCyQT1QQT0277yMUOKAskI9UEI9OO+8jOKIoFDigLJBUD02MMKw77yM5Y+v6K+B4pazUOKAskFQ5Li6562J6L655LiJ6KeS5b2i77yM5YiZUOKAslA9UEEuPC9wPg==
- 答案：RA==
PGRpdj7op6PvvJrov57mjqVQUOKAsu+8jOeUseaXi+i9rOeahOaAp+i0qOWPr+efpe+8jFDigLJBPVBBPTbvvIziiKBCQVAnPeKIoENBUO+8jDxicj7iiLXiiKBCQVA94oigQkFQ77yMPGJyPuaVheWPr+W+l++8muKIoFDigLJBUD3iiKBCQUM9NjDCsO+8jDxicj7iiLTilrNQ4oCyQVDkuLrnrYnovrnkuInop5LlvaLvvIw8YnI+4oi0UOKAslA9UEE9Ni48L2Rpdj4=
本课配套习题挑战模式4/5
单选题
难度系数：
4.
P为正方形ABCD内的一点，并且PA=a，PB=2a，PC=3a，则正方形的边长为（ ）
| A: 2 |
| B: 3 |
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5oqK4pazQUJQ6aG65pe26ZKI5peL6L2sOTDCsOW+l+WIsOKWs0JFQ++8jOagueaNruWLvuiCoeWumueQhuW+l+WIsDxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMy81Ri9yQkFDRTFNTVcwYURiOUtsQUFBQ0VoakZVb2swOTMucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzVGL3JCQUNFMU1NVzBhRGI5S2xBQUFDRWhqRlVvazA5My5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSI3NSI+PC9wPg==
- 提示2：PHA+5qC55o2u5Yu+6IKh5a6a55CG6YCG5a6a55CG6K+B5piO4pazUEVD5piv55u06KeS5LiJ6KeS5b2i77yM5LuO6ICM5b6X5Yiw4oigQkVDPTEzNcKwPC9wPg==
- 提示3：PHA+6L+H54K5Q+S9nENG4oqlQkXkuo7ngrlG77yM4pazQ0VG5piv562J6IWw55u06KeS5LiJ6KeS5b2i77yM54S25ZCO5YaN5qC55o2u5Yu+6IKh5a6a55CG5rGC5Ye6QkPnmoTplb/luqbvvIzljbPlj6/lvpfliLDmraPmlrnlvaLnmoTovrnplb88L3A+
- 答案：Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
在正方形ABCD内有一点P，且
. 则正方形ABCD的边长为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aaW5YWI5qC55o2u5peL6L2s55qE5oCn6LSo5b6X5Ye64pazQlBD4omM4pazQlDigLJB77yM5Yip55SoQVDigLI9UEM9Me+8jDxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC83MS9yQkFDRkZNTVcwdnpnLUNEQUFBQ0wyY1UtdFUxMzAucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzcxL3JCQUNGRk1NVzB2emctQ0RBQUFDTDJjVS10VTEzMC5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIxMTciPjwvcD4=
- 提示2：PHA+5b6X5Ye64pazQVDigLJQ5piv55u06KeS5LiJ6KeS5b2i77yM5YaN5Yip55So6L+H54K5QuS9nEJF4oqlQVDigLLkuqRBUOKAsueahOW7tumVv+e6v+S6jueCuUXvvIzliKnnlKjli77ogqHlrprnkIblvpflh7pBQueahOmVvzwvcD4=
- 答案：Qw==
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
