#### 11.2.2 bdArc

• bdArc( <B>, <A>, <C>, <R>, <orientation>, [options] )
• Description: defines an arc in the space with radius <R>, starting from $\left(AB\right)$ to $\left(AC\right)$. The plane $\left(BAC\right)$ is oriented by the basis $\left(\stackrel{\to }{AB},\stackrel{\to }{AC}\right)$ and the <orientation> is 1 if it is positively oriented, -1 if not. bdArc options:
• labelarc(<"text">). This is a macro for creating a label on the arc.
• normal := < non zero 3Dvector >. Vector that will be considered as the vector normal to the plane if the angle is flat (Nil by default).
• radscale := < number >. Number that, multiplyed by the arc radius will given the distance of the label to the arc center (1.25 by default).
• This is the macro bdCurve that is called to draw the arc, therefore bdCurve’s options can be used.