501 Geometry Questions

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