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Polygon ABCDE rotates 45° clockwise about point F to produce polygon FGHIJ as shown. What is mBCD?

Respuesta :

The order of letters is important. 
Since polygon ABCDE is rotated to produce polygon FGHIJ, then image of A is F, image of B is G, and so on.
And since rotation preserves the shape, then 
m∠BCD = m∠GHI = 127°

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