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>> No.5886433 [View]
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5886433

>>5886004

Don't draw lines as perpendicular when you don't want them to be. That's just being misleading for the sake of it.

Angles ACB = ADB (subtended by common chord AB)
Angles CAD = CBD (subtended by common chord CD)
Angles BXC = AXD (BD and AC are straight lines intersecting at X)
Thus, triangles AXD and BCX are similar. Hence, x/4 = 4/8 and so x = 2.

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