Change the length of line

Hi all
I am very new in Rhino.
could u plz tell me how can i change the length of a line?

Scale1d, or you can trim / extend it, or you can move its start or end point with PointsOn command.

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I gonna to increase radius of a circle.
to change radius from 25cm to 45cm

use scale.

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You can use the command modifyradius