Answer:
7
Step-by-step explanation:
take the perimeter of what you have now (14) and divide it by 2, because it is dilated by 1/2
<Ber=<kem(vertically opposite angle)
9x-17=3x+31
9x-3x=31+17
6x=48
x=48/6=8
<kem=3×8+31=55°is answer
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C
