【进阶级练习题62】 # N+ ?! W) [- Q$ n f8 f- p9 f% E( U G求:" \6 d+ ^9 o6 |4 Q7 r4 \
1. BC 之弧长为何?$ n4 x% B/ i# \5 W: s
a. 167.6253 b. 167.6325 c. 167.6523+ w" l7 ?6 g- I8 E: n1 v
2. DE之弧长为何?% F* `- C% R4 A6 \! b7 ~
a. 122.5256 b. 122.5526 c.122.56528 m" s4 W3 I" s
3. FG 之弧长为何? . N: k* O, m; ^4 l3 c h a. 79.3347 b. 79.3473 c. 79.3734. S' @: T6 g: w5 o# U" f: F
4. ∠AOB 之角度值为何? 7 t# c0 E$ \- f$ ^0 O7 m2 q( X a. 72.256° b. 72.526° c. 72.652° ; J. ~! B1 s, S; d5. 剖面线区域之面积为何?9 F9 ]& A* R- {2 G1 ?2 g* h
a. 3879.2023 b. 3879.2230 c. 3879.2302