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2. b 弧之长度为:* ?, _! f4 e; v# s
c. 60.4600 ! e2 W6 `. G3 ~/ L7 X- T3. c 弧之长度为:3 |+ ~: i( B- t8 f4 x2 U
b. 65.5325# \8 a- ^8 ]8 R
4. d 弧之长度为: 9 B" v9 Q% O J8 l; M* V c. 108.61008 }' P; P7 N8 @3 C0 t2 d( k
5. e 弧之长度为:5 I( d5 e( D$ f+ P# ]' }
a. 76.8018' R: M9 T# J1 z6 r1 f7 T
6. f 弧之长度为:& r0 [% A1 ?$ ?' m
c. 65.4325 # `9 q, E/ F3 w# R7. g 弧之长度为: - h( V: C7 ?$ J b. 126.4051. q Q |$ G: }: T8 J4 T
8. p 弧之长度为: 8 b5 r9 E4 p b# z a. 117.8097