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2014-08-10T23:37:36+03:00

 OA100=OA1+A1A2+A2A3+........+A99A100= 1+2+3+.............+100=100x101/2=5050cm

OM=OA1oo/2=2525cm

OA4o=1+2+3+...........+40= 40x41/2=820cm

A4oM=OM-OA4o=2525-820=1705cm


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