What is the diameter of a circle whose radius is $4.2 cm .$

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Solution

Given;
Radius of circle $= 4.2 cm$
Diameter of circle $= 2 \times radius$
Diameter of circle $= 2 \times 4.2 cm$
Diameter of circle $= 8.4 cm$
Hence, the diameter of the circle is $8.4 cm .$

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