Using Circumference to Measure Arcs
Since you now know how to find the entire circumference of a circle, you
can apply that to measuring arc lengths made by central angles. This is illus-
trated below.
C = 14π inches
D
A
B
C
7
30
30
360 °
1
12
=
AD is of the 14π circumference
part
whole circle
°
=
1
12
So AC = × 14^1 π = π
12
7
6
501 Geometry Questions