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20 Part I: Technical Mathematics
Table 3.1 Calculation of area for basic geometric shapes. Continued
Part I.C
Shape Example Formula(e)
( )
a
a+
b h
Trapezoid
A =
2
h
Regular hexagon A=
2.
597s
b
A=
3.
464r
2
2
r
s
1
Right triangle A= b×
h
2
h
b
1
Triangle A= b×
h
h
2
b
Circle A = p r 2
Where r is radius and
r
p = pi = 3.14159 . . .
( 2
1 )
Circular ring A= r r
p 2
2
r1
r 2