1/5单选题
难度：
1.如果三角形三个内角度数的比是1：2：3，则这个三角形一定是（）
| A | 锐角三角形 |
| B | 直角三角形 |
| C | 钝角三角形 |
| D | 不能确定 |
- 提示1：
- 5LiJ6KeS5b2i55qE5YaF6KeS5ZKM5Li6MTgwwrA=
正确答案：Qg==
6Kej562U77ya6K6+5LiA5Lu95Li6eO+8jOWImXgrMngrM3g9MTgwwrDlj6/lvpd4PTMwwrDvvIwzeD05MMKw5piv55u06KeS5LiJ6KeS5b2iPGJyPuaVhemAiUI=
2/5单选题
难度：
2.具备下列条件的三角形中，不是直角三角形的是（）
| A | ∠A+∠B=∠C |
| B | ∠B=∠C= ∠A |
| C | ∠A=90°-∠B |
| D | ∠A-∠B=90° |
- 提示1：
- 5ZCE6YCJ6aG56YCQ5LiA5Yik5pat
- 提示2：
- 4oigQSviiKBCK+KIoEM9MTgw
正确答案：RA==
6Kej562U77ya5ZCE6YCJ6aG56YCQ5LiA5Yik5pat77yMQS7iiKBBK+KIoEIr4oigQz0xODDCsO+8jOKIoDxpPkE8L2k+K+KIoDxpPkI8L2k+PeKIoEPlj6/lvpfiiKBDPTkwwrDvvIzmmK/nm7Top5LkuInop5LlvaLvvJtCLuiuvuKIoEI94oigQz1477yM5YiZ4oigQT0yeO+8jOWPr+W+lzR4PTE4MMKw77yM4oigQT05MMKw5piv55u06KeS5LiJ6KeS5b2i77ybQy7iiKBBK+KIoEI9OTDCsO+8jOWImeKIoEM9OTDCsO+8jOaYr+ebtOinkuS4ieinkuW9ou+8m0Qu4oi14oigPGk+QTwvaT4t4oigPGk+QjwvaT49OTDCsO+8jOKItOKIoEHvvJ45MMKwLOWImeKIoELvvJw5MMKw77yM4oigQ++8nDkwwrDvvIzkuI3mmK/nm7Top5LkuInop5LlvaI8YnI+5pWF6YCJRA==
3/5单选题
难度：
3.如图，∠A=50°，BD，CD分别是∠B，∠C的平分线，则∠BDC等于（）
| A | 65° |
| B | 100° |
| C | 115° |
| D | 130° |
- 提示1：
- 5YWI5qC55o2u6KeS5bmz5YiG57q/55qE5oCn6LSo5rGC5Ye64oigREJD44CB4oigRENC5LiO4oigQeeahOWFs+ezuw==
- 提示2：
- 5YaN5qC55o2u5LiJ6KeS5b2i5YaF6KeS5ZKM5a6a55CG5rGC6Kej5Y2z5Y+v
正确答案：Qw==
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
4/5单选题
难度：
4.如图，在
中，
，
为
上一点，则
可能是（ ）
中，，为上一点，则可能是（ ） | A | 10° |
| B | 20° |
| C | 30° |
| D | 40° |
- 提示1：
- 4oigRD05MMKw4oi04oigQkNE5piv5Liq6ZSQ6KeS
- 提示2：
- 4oigQUNE5piv5Liq6ZKd6KeS
正确答案：Qg==
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
5/5单选题
难度：
5.
如图，ABCDE是封闭折线，则∠A+∠B+∠C+∠D+∠E为度( )
| A | 90° |
| B | 180° |
| C | 360° |
| D | 270° |
- 提示1：
- PHA+6L+e5o6lQUM8L3A+
- 提示2：
- PHA+5oqK6KaB5rGC55qE6KeS6YO96L2s5o2i5Yiw4pazQUJD5LitPC9wPg==
- 提示3：
- PHA+5qC55o2u5LiJ6KeS5b2i55qE5YaF6KeS5ZKM5a6a55CG6L+b6KGM6K6h566XPC9wPg==
正确答案：Qg==
PHA+6Kej562U77ya6L+e5o6lQUPvvI48YnI+5qC55o2u5LiJ6KeS5b2i55qE5YaF6KeS5ZKM5a6a55CG77yM5b6XPGJyPuKIoEQr4oigRT3iiKBDQUUr4oigQUNE77yOPGJyPuKItOKIoEEr4oigQiviiKBDK+KIoEQr4oigRT3iiKBCK+KIoEJBQyviiKBBQ0I9MTgwwrDvvI48L3A+