m |
n |
3 |
m |
n |
m |
m |
n |
3 |
m |
n |
3 |
m |
n |
m |
m |
n |
m |
m |
m |
n |
3 |
π |
6 |
π |
6 |
1 |
2 |
π |
6 |
π |
6 |
π |
3 |
1 |
2 |
3 |
2 |
1 |
2 |
1 |
2 |
3 |
2 |
3 |
2 |
3 |
π |
6 |
π |
12 |
3 |
x |
4 |
x |
4 |
x |
4 |
1 |
2 |
c |
b |
cosC |
cosB |
A.直角三角形 | B.等腰直角三角形 |
C.等腰三角形 | D.等腰或直角三角形 |
| ||
2 |
π |
2 |
π |
2 |
DB |
DC |
DA |
AB |
AC |
A.直角三角形 | B.等腰三角形 |
C.等腰直角三角形 | D.等边三角形 |
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