3 |
π |
3 |
4
| ||
5 |
π |
2 |
3 |
| ||
cos20° |
| ||
cos20° |
cos20° |
sin20° |
2(
| ||||||
cos20° |
cos20° |
sin20° |
2sin(20°-30°) |
cos20° |
cos20° |
sin20° |
sin20° |
cos20° |
π |
3 |
4
| ||
5 |
1 |
2 |
| ||
2 |
4
| ||
5 |
3 |
π |
6 |
4
| ||
5 |
π |
6 |
4 |
5 |
π |
2 |
π |
6 |
3 |
5 |
π |
6 |
π |
6 |
| ||
2 |
π |
6 |
1 |
2 |
π |
6 |
| ||
2 |
3 |
5 |
1 |
2 |
4 |
5 |
3
| ||
10 |
x |
2 |
π |
4 |
π |
6 |
2π |
3 |
3 |
2 |
π |
6 |
2π |
3 |
π |
2 |
A.等腰三角形 |
B.直角三角形 |
C.等腰直角三角形 |
D.等腰三角形或直角三角形 |
3 |
2sin280° |
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