Answer Posted / senthil velan

Circumference of a circular rod (c) = 2 * 3.14 * r;
diameterer = 2r;
so diameter of a rod = c / 3.14;

c can be measured by taking a string and swriling around
the rod and measure the length with a scale. For a 16mm
rod, the length will around 50 mm.

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