Answer:
Explanation:
You want to complete the equation and solve for d, the longer segment of one of two secants that meet outside the circle.
Secant relation
The given relation between segments of the secants is ...
ab = cd
Filling in the given lengths, this becomes ...
4·12 = 6·d
Solving for d, we have ...
d = (4·12)/6 = 4·2
d = 8
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