Centroid of Circle

Centroid of a circle is very easy to determine. Centroid of circle lies at the center of a circle that is also called as the radius of circle from edges of a circle. As shown below.

Examples

  • ¬†Find the center of gravity (centroid) of circular wheel whose diameter is 20cm.

Solution:

Centroid of circular section lies at its center i.e., D/2

centroid of circle

R= D/2 = 20/2 = 10cm= Answer

  • Find the centroid of hollow circular section whose outer diameter is 20cm and 16cm inner diameter.

    centroid of hollow circular section

    Solution:

    Centroid of circular section lies at D/2 from each side of a circle.

    Hence, with respect to outer diameter centroid lies at;
    D/2 = 20/2 = 10cm
    With respect to inner diameter centroid lies at;
    D/2 = 16/2 = 8cm = Answer

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