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This problem refers to the figure below, which shows a diagram for a bike frame. 

Given BC = 49 cm, BD = 61 cm, CD = 80 cm, ABC = 53, and ACB = 66, find the following. (Round your answers to the nearest whole number.) 

         (a) the length of the chainstay,  AC

_______ cm

 (b) BCD

BCD = _______

 

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