3 |
5 |
π |
4 |
π |
4 |
3 |
5 |
π |
4 |
1-cos2(
|
4 |
5 |
π |
4 |
π |
4 |
π |
4 |
π |
4 |
π |
4 |
π |
4 |
4 |
5 |
| ||
2 |
3 |
5 |
| ||
2 |
7
| ||
10 |
1-cos2(B+C) |
4 |
5 |
π |
4 |
7
| ||
10 |
a |
sinA |
b |
sinB |
c |
sinC |
b | ||||
|
c | ||||
|
5 | ||
|
25 |
4 |
25
| ||
8 |
35
| ||
8 |
1 |
2 |
1 |
2 |
25
| ||
8 |
7
| ||
10 |
175 |
16 |
3 |
1 |
2 |
π |
12 |
π |
2 |
π |
24 |
π |
24 |
π |
24 |
| ||
|
|
| ||
|
|
BC |
| ||
|
|
| ||
|
|
1 |
3 |
A.直角三角形 | B.等边三角形 |
C.三边均不相等的三角形 | D.等腰非等边三角形 |
3 |
3 |
π |
12 |
a |
b |
b |
a |
c2 |
ab |
m |
3 |
n |
m |
n |
A |
2 |
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