It is often used for the direct sum.
I have posted a link about that.
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Circumference is the outside of the circle and the inside is the are of the circle. And inside of the circle, there is diameter and radius. Radius is from the center point to the edge of the circle and diameter is all the way across.
The length of the edge of a circle.
In math decrease means minus and increase means plus
it means it is close
75 Percent.