Answer:
x =
Step-by-step explanation:
Given 2 intersecting chords, then the product of the parts of one chord is equal to the product of the parts of the other chord, that is
18x = 9 × 3 = 27 ( divide both sides by 18 )
x = =
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By the law of cosines, the angle 
satisfies
which reduces to
which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
which reduces to
which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).