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# C.O.G of irregular plane??? Watch

1. i hope you can see the picture, i am completely thrown with this one. my previous answer was as follows but was wrong if someone can help me understand this would be much appreciated.

area 1 = 400mm2
area 2 = 400 mm2
area 3 = 300mm2

centre 1 = 5mm
centre 2 = 30mm
centre 3 = 55mm

(c1a1) + (c3a2) + (c3a3) / (a1 + a2 + a3) = 27.7272mm WRONG!!

HELP xx
2. (Original post by lauren088)

i hope you can see the picture, i am completely thrown with this one. my previous answer was as follows but was wrong if someone can help me understand this would be much appreciated.

area 1 = 400mm2
area 2 = 400 mm2
area 3 = 300mm2

centre 1 = 5mm
centre 2 = 30mm
centre 3 = 55mm

(c1a1) + (c3a2) + (c3a3) / (a1 + a2 + a3) = 27.7272mm WRONG!!

HELP xx
You have worked out the distance from the top rather than the distance from the bottom?
3. any idea how i do it from the bottom?
4. (Original post by lauren088)
any idea how i do it from the bottom?

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