BC2 |
AB |
BC |
CB |
CA |
BC |
BA |
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.等边三角形 |
AB |
BC |
CB |
CA |
BC |
BA |
BC |
AB |
BA |
CB |
CA |
CB |
CA |
BC2 |
CB |
CA |
BC |
BC |
CA |
BC |
BA |
π |
2 |
OA |
OB |
e |
e |
2π |
3 |
a |
e |
e |
b |
e |
e |
a |
b |
a |
b |
c |
a |
c |
a |
b |
c |
OA |
OB |
OC |
0 |
OA |
OB |
OB |
OC |
A.钝角三角形 | B.直角三角形 | C.等边三角形 | D.等腰三角形 |
OA |
OB |
OB |
OC |
OC |
OA |
A.三个内角的角平分线的交点 |
B.三条边的垂直平分线的交点 |
C.三条中线的交点 |
D.三条高的交点 |
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