Chapter 6 Basic Geometric Constructions 193
Using the Two Points Option
(CAD Procedure)
The
Two Points
option of the
Circle
com-
mand allows you to draw a circle by picking
two points to defi ne the diameter. You can
pick points on screen or enter coordinates. The
following procedure is used.
1. Square ABCD is given. Refer to
Figure 6-44A.
2. Enter the
Circle
command. Enter the
Two Points
option.
3. Using the Midpoint object snap, select
the midpoint of Side AB to define one fi
point on the diameter of the circle. Select
the midpoint of Side CD to specify the
second point. This inscribes the circle
within the square. Refer to Figure 6-44C.
Using a Triangle and Compass
(Manual Procedure)
1. Given Square ABCD, use a 45° triangle
to draw diagonals AC and BD,
Figure 6-44A. The intersection locates
the center of the circle.
2. Locate the midpoint of one side of the
square (Point E), Figure 6-44B.
3. The distance from the center of the circle
to Point E is the radius. This radius
will inscribe a circle within the square,
Figure 6-44C. Use a compass to complete
the required circle.
Construct a
Circle within
a Square
CAD
Figure 6-44. Constructing a circle within a given square using a 45° triangle and a compass.
A D
B C
A
A D
B C
B
E
A
O
D
B C
C
E