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 ABCD is a quadrilateral such that AB=CD. We know that  angleA= angle B= 60 degrees and AD=CB=1 . If AB=10 , what is DC?

 Sep 18, 2020
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ABCD is a quadrilateral such that AB\(\parallel\)CD. We know that angleA= angle B= 60 degrees and AD=CB=1 . If AB=10 , what is DC?

 

Hello Guest!

 

\(\overline{DC}=\overline{AB}-2\cdot (1\cdot cos\ 60^{\circ})=10-2\cdot 0.5\)

\(\overline{DC}=9\)

laugh  !

 Sep 19, 2020
edited by asinus  Sep 19, 2020
edited by asinus  Sep 19, 2020

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