In the given figure, find the value of ∠BCD.
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Explanation:

4x+5+x+15=180°(sum of opposite angle of cyclic quadrilateral is supplementary)

5x+20=180

5x=180-20

x=160/5

x=32°

hence,

the value of x=32°

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the answer is:

b) to show the progression of inventions that took place in the bicycling industry.

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