Answer:
x = 58
Explanation:
The angle formed by two secants = 1/2(difference of intercepted arcs)
51 = 1/2 (160 - x)
Multiply each side by 2
51*2 = 2*1/2 (160-x)
102 = 160-x
Subtract 160 from each side
102-160 = 160-160-x
-58 = -x
Multiply each side by -1
58 =x