| ||
3 |
A+C |
2 |
2 |
π |
3 |
| ||
3 |
2 |
3 |
A+C |
2 |
1+cos(A+C) |
2 |
1-cosB |
2 |
| ||
3 |
2 |
3 |
1-
| ||
2 |
8
| ||
18 |
a2+c2-b2 |
2ac |
2 |
3 |
4 |
3 |
3 |
b2+c2-a2 |
2bc |
b |
2c |
| ||
2
|
| ||
6 |
1-cos2A |
1-
|
| ||
6 |
π |
3 |
π |
3 |
π |
3 |
| ||
6 |
1 |
2 |
| ||
6 |
| ||
2 |
| ||||
12 |
AH |
AB |
BC |
AH |
AB |
AH |
AC |
AH |
AC |
| ||
|
|
BC |
AC |
AB |
A.
| B.
| C.
| D.
|
A.30° | B.45° | C.60° | D.120° |
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