A.b=10∠A=45°∠C=70° | B.a=20 c=48∠B=60° |
C.a=7 b=5∠A=98° | D.a=14 b=16∠A=45° |
a |
sinA |
b |
sinB |
c |
sinC |
10sin45° |
sin65° |
10sin70° |
sin65° |
a2+b2-c2 |
2ab |
a |
sinA |
b |
sinB |
5sin98° |
7 |
a |
sinA |
b |
sinB |
16×
| ||||
14 |
4
| ||
7 |
4
| ||
7 |
4
| ||
7 |
A.
| B.
| C.2
| D.
|
B |
2 |
a+c |
2c |
A.正三角形 |
B.直角三角形 |
C.等腰三角形或直角三角形 |
D.等腰直角三角形 |
3 |
| ||
3 |
a |
c |
tanA |
tanC |
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