DRAWING CIRCULAR ELEMENTS
• To avoid drawing am
ismatched t angent to a circle
or curved line segment, always draw the curvilinear
element first.
• Then draw the tangent from the circle or arc.
• Care should be taken to matchthe pen or pencil line
weights of circles and arcs to the rest of the drawing.
• T draw an arc of a given radius tangent to two given
o
straight line segments, first drawlines parallel t othe
given lines at a distance equal to the desired radius
of the arc.
• The intersectionof these lines establishes the center
of the desired arc.
• To draw two circles that are t angent to eachother,
first draw a linefrom the center of one to the desired
tangential point on its circumference.
• The center of the second circle must liealong the
extensionof this line.
22 I ARCHITECTURAl GRAPHICS