The different ways to generate circles respectively arcs of circles are:
Figure 45: Characterizations for circle construction
Exercise (CREATE CIRCLE CTRR):
Generate an arbitrary point named P1 , then construct a circle with radius= 55
centered on P1.
Solution:
After generating your point P1, click the icons for the command
CREATE CIRCLE CTRR. For the mandatory parameter CTR (center), either
enter the name of P1 in the command line, or select this point. After that, you
enter the value of the radius R on the displayed numeric keypad.
Exercise (CREATE CIRCLE CTRE):
Generate one more point named P2. Construct a circle centered on P1 and
running through P2.
Solution:
After producing P2 and entering P1 for center in the command
CREATE CIRCLE CTRE, click the icon for the mandatory parameter
ENT (entity). A range of possible objects that can be used for this
parameter is displayed. In this exercise, the circle is touching a
point.
Click the icon, and approach point P2 with the cursor. The circle is already
hanging at the cursor. Select point P2 and conclude the command with
the right mouse button.
Exercise (CREATE CIRCLE EER):
Generate 2 line segments named G1 and G2 at right angles, and then construct the
inner circle to the segments with radius= 8 .
Tip: When solving this exercise, it may be useful to turn the pick circle
off.
Solution:
After producing the line segments G1 and G2, click the icons for the command
CREATE CIRCLE EER. If then you choose the mandatory parameters ENT1
and ENT2 , a choice of possible object types is generated for each one,
similarly to the preceding exercise. In our example, it will be the two line
segments. After that, you enter the value of the radius R on the
displayed numeric keypad. SISCAD-P then displays all possible circles, and
you can select the intended one(s) with the optional parameter SEL
(selection).