In a circle it means Radius squared
In other words it means the radius times itself
radius
Radius times two (r x r)
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You mean what Is the circumference of a circle? pi*(r)squared.
That's the formula for the area of a circle.
R means radius because the area of a circle = pi*radius2
r2+r2 = 2r2
that is 14,519.4 squared
If r-squared = theta then r = ±sqrt(theta)
+r and -r
its 2 pie r squared BUT you have to add back the base (a circle) which is pie r2 The original formula is 4 pie r squared Your new formula is (2 pie r squared + pie r squared)
dependswhat's r