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Question

Diagonals AC and BD of a parallelogram ABCD intersect each other at O.If OA = 3 cm and OD = 2 cm, determine the length of AC.

A
2.0 cm
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B
4.0 cm
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C
3.6 cm
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D
6.0 cm
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Solution

The correct option is B 6.0 cm
ABCDisaparallelogram.ABDCABD=BDC&ACD=BAC(alts)AlsoAB=DC(oppositesidesofaparallelogram)ΔAOB&ΔDOCarecongruentbyASAtest.AO=OC=3cm&DO=OB=2cm.NowAC=AO+OC=(3+3)cm=6cmandBD=DO+OB=(2+2)cm=4cm.ThereforeAC=6cm,BD=4cm

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