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In quadrilateral BCED, we have BD = 11, BC = 9, and CE=2. Sides BD and CE are extended past B and C, respectively, to meet at point A. If AC = 8 and AB = 5, then what is DE?

 Jul 24, 2020
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There are two different triangles: ΔABC  and  ΔADE   These triangles share the same angle,  ∠BAC  or  ∠DAE

 

1)       Use the Law of cosines to calculate an angle BAC of a triangle ABC.

 

2)       Use the Law of cosines to find the length of DE.    smiley

 

 Jul 24, 2020
edited by Dragan  Jul 24, 2020
edited by Dragan  Jul 24, 2020

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