Answer :

Step1:Draw circles of radius 4 and 6 cm



Step 3: Draw tangent to inner circle from C



AD is perpendicular to DC- tangent and radius


In Δ ADC


AC is radius


AC2 = AD2 + DC2


62 = 42 + DC2


36 = 16 + DC2


DC2 = 20


DC = 2 cm


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