5 ~% J+ v( A) w0 n求: 4 _) Z$ W' {0 [2 f8 x" U3 t1. AB长度为何?# b9 D2 m2 e( E; M$ g( P
a. 107.6909 b. 107.9690 c. 107.9960 / A2 G$ P& b, i7 x& z' H2. BC长度为何?: y! o& }" M, i# |9 u' A
a. 74.6890 b. 74.8960 c. 74.9860% f5 m6 l$ G( S+ \4 T
3. ∠ABC角度为何? ' W k o1 z4 r& n% v a. 48.0352° b. 48.3502° c. 48.5302°7 t0 V. j* H- W7 y& D4 Q& H8 Q
4. 蓝色剖面线区之周长为何? 3 u5 p# j6 E; j( i2 P* G; r- _ a. 169.6099 b. 169.6909 c. 169.6990 ' v4 t& P6 w4 q% k. n% F5. 绿色剖面线区之面积为何?3 P( |8 Q$ K( X J
a. 306.2937 b. 306.3729 c. 306.3792