a |
c |
r |
m |
b |
c |
r |
n |
rc |
m |
rc |
n |
r2 |
m2 |
r2 |
n2 |
mn | ||
|
r2c2 |
mn |
rc |
m |
rc |
n |
mn |
r |
m2+n2 |
1 |
2 |
r2c2 |
2mn |
1 |
2mn |
mn | ||
|
m2+n2 |
m2+n2+mn+(m+n)
| ||
m2+n2 |
m2+n2+mn+(m+n)
| ||
m2+n2 |
S△BGC |
S△ABC |
3 |
A.1 | B.2 | C.3 | D.4 |
A.三边的垂直平分线的交点 |
B.三条高的交点 |
C.三条角平分线的交点 |
D.三条中线的交点 |
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