Explanation:
Angles EXTERNAL to a circle are equal to 1/2 the difference of the intercepted arcs
arcs are 17x and 360 - 17x
75 = 1/2(17x - ( 360-17x)
75 = 1/2 ( 17x - 360 + 17x)
150 = 34x-360
510 = 17x
x =30
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