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Re: In the figure above, DA＝DB＝DC, what is the value of x? [#permalink]

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23 Jan 2013, 02:35

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Don't know about what others think but I shall approach this problem using the property of isosceles triangles. The two equal sides will have the same measure in angles too. Since DA=DC, hence angle DAC must be 50. Similarly, angle ABD must be 30. Thus, angle BDA=180-60 or 120 and angle ADC=180-100=80. Angle BDC is 120+80=200. Also, since DB=DC, hence angle DBC= angle DCB and angle BDC=360-200=160. 160+2x=180, therefore x=10. Hope that helps.

Re: In the figure above, DA＝DB＝DC, what is the value of x? [#permalink]

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04 Mar 2014, 17:36

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Re: In the figure above, DA＝DB＝DC, what is the value of x? [#permalink]

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28 Aug 2015, 07:31

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Re: In the figure above, DA＝DB＝DC, what is the value of x? [#permalink]

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21 Sep 2016, 12:20

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