Two sides are the same for sure. Now we need to determine if side DB is the same length. This shape is a rhombus. A rhombus will have two equilateral triangles. We know this a rhombus because all the outer sides are congruent. AB congruent to AD congruent to DC congruent to BC.

EQUILATERAL

Deca=10

10 sides

Aug 6th, 2014

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