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The last question on page 5 1 of Shanghai junior high school sixth grade mathematics exercise book.
A moving distance: arc a 1+ arc A 1 A2+ arc A2 A3.

120/ 180πr

=6.28(㎝)

B moving distance: arc B 1+ arc B 1 B2+ arc B2 B3.

=2πr

=6.28(㎝)

C moving distance: arc C 1 C2.

240/ 180πr

=4. 19(㎝)

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