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geometry

 compute the radius of a given circle

Parameters

 c - circle

Description

 • The routine returns the radius of the given circle c.
 • The command with(geometry,radius) allows the use of the abbreviated form of this command.

Examples

 > $\mathrm{with}\left(\mathrm{geometry}\right):$
 > $\mathrm{circle}\left(\mathrm{ABC},\left[\mathrm{point}\left(A,0,0\right),\mathrm{point}\left(B,2,0\right),\mathrm{point}\left(C,1,3\right)\right]\right):$
 > $\mathrm{circle}\left(c,{x}^{2}+{y}^{2}=9,\left[x,y\right]\right):$
 > $\mathrm{radius}\left(\mathrm{ABC}\right)$
 $\frac{{1}}{{9}}{}\sqrt{{25}}{}\sqrt{{9}}$ (1)
 > $\mathrm{radius}\left(c\right)$
 $\sqrt{{9}}$ (2)