Note

•Some measurements cannot be locked. For details, see the “Lockable” column in the table under “Viewing the Measurements of an Object” (page 14-41).

uTo unlock a particular measurement

You can unlock a particular measurement by performing any one of the following operations.

•If the icon to the right of the measurement box is , move the highlighting to the icon and press w.

•Move the highlighting to the up arrow button to the right of the icon and press w. On the menu that appears, select [Unlock] and then press w.

uTo unlock all objects on the screen

Perform the following operation: K(Option) – 4:Clr Constraint.

This unlocks all locked settings.

Note

The above operation unlocks both measurements you locked manually, as well as objects that are locked automatically whenever they are drawn. For example, the above operation unlocks all of the following lock conditions.

•The lock that is applied when you draw a rectangle that keeps its opposing sides equal (opposing side congruence lock)

•The lock that is applied when you draw an isosceles triangle (ABC) that keeps side AB and side BC equal (side AB and side BC congruence lock)

•The lock that is applied when you draw an infinite line that keeps the line passing through two points (point A and point B) (infinite line and point A, B incidence lock)

•The relationship between the line segment and perpendicular bisector that is formed when you select a line segment and perform the following operation: 4(Construct) – 1:Perp Bisector.

•The (locked) similarities of objects when you select the objects and perform the following operation: 5(Transform) – 5:Dilation.

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