【进阶级练习题62】 6 |1 n, U* ]7 p% |& T9 y, {3 E+ b3 h5 ] t1 p; [# R
求: ) Q% E1 f+ O* N% X+ ?1. BC 之弧长为何? 8 R+ [! i1 ]: c- S a. 167.6253 b. 167.6325 c. 167.65238 @/ R& m! n; U L# b$ F
2. DE之弧长为何? 0 B$ u5 c- {0 m7 x/ e a. 122.5256 b. 122.5526 c.122.5652 ! j5 _! a( e. s3 v6 |3. FG 之弧长为何?6 g7 G" I$ \2 K7 H! [5 C" Z
a. 79.3347 b. 79.3473 c. 79.3734 5 P* i; [4 l* O# A- y- f U; m4. ∠AOB 之角度值为何? |( B& z c# y a. 72.256° b. 72.526° c. 72.652°/ L/ l. y) k+ d, k" [* o; u
5. 剖面线区域之面积为何? 4 o3 V$ I% |- k( ^' Z a. 3879.2023 b. 3879.2230 c. 3879.2302