重心坐标的公式

由重心坐标的公式：

i i

C

a x

X

G

⨯

=

∑

261 2.48499.2,0.3, 1.2

b b B

G kN X m Y m

=⨯⨯⨯=== ()3

0.250.47 2.224 6.39

c

a m

=+⨯⨯=

6.3926166.14

c

G kN

=⨯=

110.25 2.228 1.810.22 2.22826.39

c C f X ⨯⨯⨯+⨯⨯⨯⨯= 10.70.7 2.92 1.44 1.703

c C f X ++==⇒= 210.25 2.228 2.260.22 2.22826.39

C C f Y ⨯⨯⨯+⨯⨯⨯⨯= 2 2.15 2.15 1.93 2.08 2.213

C C f Y ++==⇒= ()30.230.45 2.224 6.04

D a m =+⨯⨯= 6.0426157.04D G kN =⨯=

20.23 2.228 1.810.50.23 2.2286.04

D f X ⨯⨯⨯+⨯⨯⨯⨯= 10.230.230.450.3 1.743

D D f X ++==⇒= 20.23 2.2280.1150.50.23 2.2286.04

D f Y ⨯⨯⨯+⨯⨯⨯⨯= 20.230.230.450.30.183D D f Y ++==⇒= 499.20.3166.14 1.7157.04 1.710.85499.2166.14157.04i i

a x X a

⨯⨯+⨯+⨯===++∑ 499.2 1.2166.14 2.21157.040.18 1.21499.2166.14157.04i i a y

Y a ⨯⨯+⨯+⨯===++∑ 则整个图形的重心在（0.85、1.3）处