Which point defines the positive Y direction in a USER FRAME?

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Multiple Choice

Which point defines the positive Y direction in a USER FRAME?

Explanation:
In a USER FRAME, orientation is set by using a reference point along the Y axis in addition to the origin. The XY point is located along the Y direction from the origin and its vector from the origin determines which way is positive Y. The origin fixes where the frame is, but by itself it doesn't define axis directions. A separate point along the X direction would define positive X. So the XY point is the one that establishes the positive Y direction.

In a USER FRAME, orientation is set by using a reference point along the Y axis in addition to the origin. The XY point is located along the Y direction from the origin and its vector from the origin determines which way is positive Y. The origin fixes where the frame is, but by itself it doesn't define axis directions. A separate point along the X direction would define positive X. So the XY point is the one that establishes the positive Y direction.

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