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Using the Measurement Box

12. Press w.

• This changes the length of size AC to 120 and resizes the entire triangle accordingly.

View Window settings are update automatically so the resized triangle can fi t on the screen. Note that the scale values on the axes also change.

13. Now input 90 as the length of side AC and then press w.

Using A as the point of reference, side AC is resized to 90. In this case, the length of side AC is shortened, without altering the overall size of the triangle.

Locking or Unlocking a Measurements of an Object

By “locking a measurement” we mean that the corresponding object cannot be moved. For example, if we lock a point to a circle and move the circle, the point will also move.

uTo lock or unlock a measurement

The icon to the right of the measurement box indicates whether a measurement is locked or unlocked.

QMeasurement is unlocked.

FMeasurement is locked.

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