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Question

In the given figure, if AB = AC and D is the midpoint of BC, then which of the following is true ?


A

ADBADC by RHS postulate

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B

ADBADC by SSS postulate

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C

AB bisects BAC

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D

If BAC=80, then ABD=80

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Solution

The correct option is B

ADBADC by SSS postulate


In ABD and ACD

(i) AB = AC .........(given)

(ii) BD = CD .........(given)

(iii) AD = AD ..........(common)

(iv)ABDACD ......(SSS Postulate)

(v) BAD=CAD .....(cpct)

AD bisects BAC

(vi) ABD=ACD .....(cpct)

If BAC=80, then ABD=ACD=50 ( not 80)


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