radius = diameter divided by two
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(-b +- sqr( b^2 -4ac))/2a
It means to multiply the radius by itself: radius x radius
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.
The diameter is twice the radius. So multiply the radius by 2
The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.