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Mathematics, 12.02.2021 01:00 blackchina71

The figure below shows a trapezoid, ABCD, having side AB parallel to side DC. The diagonals AC and BD intersect at point O. If the length of AO is three times the length of CO, the length of DC is (1 point)
three times the length of OC
three times the length of DO
one-third of the length of AC
one-third of the length of AB

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