π |
4 |
| ||
10 |
π |
2 |
3π |
4 |
A.-
| B.
| C.
| D.-
|
π |
4 |
| ||
10 |
π |
2 |
3π |
4 |
π |
4 |
7
| ||
10 |
π |
4 |
π |
4 |
7
| ||
10 |
| ||
2 |
| ||
10 |
| ||
2 |
4 |
5 |
a |
b |
a |
b |
8 |
5 |
π |
4 |
a |
b |
a |
b |
1 |
5 |
π |
2 |
3 |
π |
2 |
a |
b |
π |
2 |
a |
b |
2 |
5 |
5
| ||||
2cos2
|
DB |
DC |
CD |
DC |
DA |
BC |
A.直角或等腰三角形 |
B.等腰三角形 |
C.等腰三角形但不一定是直角三角形 |
D.直角三角形但不一定是等腰三角形 |
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