& F- f8 [/ g+ o& t% }2 ]求:2 n7 ?; F e% C) d* C* K
1. BC 之弧长为何? 9 W7 i- C' S8 c a. 167.6253 b. 167.6325 c. 167.6523 ! F# C# b8 t5 B! W2. DE之弧长为何? F% X- P E* B$ k$ W6 a
a. 122.5256 b. 122.5526 c.122.5652- D$ d! _, N7 D# f! G
3. FG 之弧长为何? - O& `( F8 \5 l) C2 @' c: q a. 79.3347 b. 79.3473 c. 79.3734( L2 R0 o3 R( L
4. ∠AOB 之角度值为何? {! Y# m3 F9 m2 D a. 72.256° b. 72.526° c. 72.652°9 ?% f; [4 j; t- h: t8 I
5. 剖面线区域之面积为何? 1 k5 z+ Y' I t. W9 A) I a. 3879.2023 b. 3879.2230 c. 3879.2302