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Question

If ABCD is a parallelogram, then the angle bisectors of A and D meet at ‘O’. The measure of AOD is 45


A

True

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B

False

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Solution

The correct option is B

False


LetA=x
then D=(180x)
(Since the adjacent angles of a parallelogram sum up to 180)

A2=x2=DAO
andD2=(180x)2=90x2=ADO

In ΔAOD,

AOD+ADO+DAO=180 [Angle sum property of a triangle]
AOD=180[ADO+DAO]
AOD=180[x2+90x2]
or AOD=18090=90
The measure of AOD is 90


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