中学生网络课堂本课配套习题挑战模式1/4
单选题
难度系数：
1.已知△ABC中，
，则该三角形为（ ）
，则该三角形为（ ） | A: 等腰三角形 |
| B: 等边三角形 |
| C: 直角三角形 |
| D: 不能确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：QQ==
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
本课配套习题挑战模式2/4
单选题
难度系数：
2.直线
相交于点A，动点B、C分别在直线上且异于点A，若
的夹角为60°，
，则△ABC的外接圆的面积为（ ）
相交于点A，动点B、C分别在直线上且异于点A，若的夹角为60°，，则△ABC的外接圆的面积为（ ） | A: 2π |
| B: 4π |
| C: 8π |
| D: 12π |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruato+W8puWumueQhueahOaOqOiuuuWkluaOpeWchueahOebtOW+hDxpbWcgd2lkdGg9NTYgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDcvMjIvckJBQ0psUkVadURqLXVUNkFBQUNPQnNrNGJFNjMwLnBuZyI+77yM5rGC5Ye6Uu+8jOeEtuWQjuaxguWHuuWkluaOpeWchueahOmdouenrw==
- 答案：Qg==
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
本课配套习题挑战模式3/4
单选题
难度系数：
3.在△ABC中，A：B：C=1：2：3，那么三边之比a：b：c等于（ ）
| A: 1：2：3 |
B: 1： ：2 |
| C: 3：2：1 |
| D: 2：：1 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrkHvvJpC77yaQz0x77yaMu+8mjPku6Xlj4ogQStCK0M9MTgwwrDvvIzmsYLlh7pB77yMQu+8jEPnmoTluqbmlbDvvIznhLblkI7msYLlh7pzaW5B77yMc2luQu+8jHNpbkM=
- 提示2：IOagueaNruato+W8puWumueQhueahOaOqOiuumHvvJpi77yaYz0gc2luQe+8mnNpbkLvvJpzaW5D5rGC6Kej
- 答案：Qg==
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
本课配套习题挑战模式4/4
单选题
难度系数：
4.设三角形ABC的内角A，B，C所对的边分别为a，b，c，若
，则△ABC的形状为（ ）
，则△ABC的形状为（ ） | A: 锐角三角形 |
| B: 直角三角形 |
| C: 钝角三角形 |
| D: 不能确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOazqOaEj++8mjxpbWcgd2lkdGg9MTA5IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzA3Lzc1L3JCQUNKMVJFWnU2anpCbGFBQUFDVGkxaDZTRTg2NS5wbmciPg==
- 答案：Qg==
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
