Answer:
70
Step-by-step explanation:
Label the 5 points (top left and top right points are a and b, middle left and right points are c and d, and the bottom points are d. all the points are the arrow sign), also label the point where the 3 lines intersects as s
we have : angle asb = 160, so angle asc = 180 - 160 = 20
angle asc + x = 90, and since asc = 20, x = 90 - 20 = 70
