Graphics Reference
In-Depth Information
b
m
h
a
Fig. 10.11.
A trapezoid with one pair of parallel sides.
a
b
b
h
a
a
Fig. 10.12.
A parallelogram formed by two pairs of parallel lines.
a
a
d
2
d
1
a
a
a
Fig. 10.13.
A rhombus is a parallelogram with four equal sides.
10.1.15 Regular Polygon (n-gon)
Figure 10.14 shows part of a regular
n
-gon with outer radius
R
o
, inner radius
R
i
and edge length
a
n
. Table 10.1 shows the relationship between the area,
an
,
R
i
and
R
o
for different polygons.
10.1.16 Circle
The circumference and area of a
circle
are given by
C
=
πd
=2
πr
(10.18)
