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The Arc Diameter command measures the diameter of an existing arc/circle on the model and draws the arc/circle. The markup label indicates the length of the diameter and the coordinates of the arc/circle 's center point. You can take this measurement only for an arc/circle that already exists in the model itself.

Glen: How does SpinFire determine what is selectable? For example, in the example shown, the ends of the small tubular shapes are not selectable.

The Arc Radius command measures the radius of an existing arc/circle on the model and draws the arc/circle. The markup label indicates the length of the radius and the coordinates of the arc/circle 's center point. You can take this measurement only for an arc/cicle that already exists in the model itself.

The Circle by Three Points command draws a circle that passes through three selected points on the model and measures the circle 's diameter. This command draws a visible diameter that passes through the first point you selected. The markup label also displays the X, Y, and Z coordinates of the circle 's center point.