Solution
Given, XYZ is the secant and ZT is the tangent
we know that, ZT$$^2$$ = ZX.ZY
$$=$$> 6$$^2$$ = (4+x)4
$$=$$> 36 = 16 + 4x
$$=$$> 4x = 20
$$=$$> x = 5 cm
Hence, the correct answer is Option A
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