g
,
, PROBLEMg5.1
Locategthegcentroidgofgthegplanegareagshow
n.
SOLUTION
Areag1:g Rectangleg72gmmgbyg45gmm.
Areag2:g Trianglegbg=g27gmm,ghg=g45gm
m.
A,gmm2 xg,gmm yg,gmm xgA,gmm3 ygA,gmm3
1 3240 36 22.5 116,640 72,900
2 -607.5 9 215 -5467.5 -9112.5
2632.5 11,172.5 63,787.5
Xg(2632.5gmm2g)g=g11,172.5gmm3
Yg(2632.5gmm2g)g=g63787.5gmm
3
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, PROBLEMg5.2
Locategthegcentroidgofgthegplanegareagshow
n.
SOLUTION
A,gin2 xg,gin. yg,gin. xgA,in3 ygA,in3
1 8 0.5 4 4 32
2 3 2.5 2.5 7.5 7.5
11 11.5 39.5
Xg(11gin2g)g=g11.5gin3
Yg(11gin2g)g=g39.5gin
3
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HillgEducation.gPermissiongrequiredgforgreproductiongorgdisplay.