) k3 P! J- ^( u1 o/ U求: - i7 p! A! H% c1 m1. a弧(红色)之长度为何?2 f0 y3 W( ~/ `! V
a. 205.4547 b. 205.5474 c. 205.7454) x4 P' Q4 Z2 y6 C o. C+ v" L
2. b线段之长度为何?: E& I, E5 G1 P1 P4 l
a. 18.4796 b. 18.7469 c. 18.9764 " @2 Q% C, P% U$ r! w& s3. c线段之长度为何?& n0 b. x' A$ r4 `
a. 81.4279 b. 81.7924 c. 81.9247 ]$ a" ~9 K7 N/ B7 W4. 蓝色剖面区之面积为何? 2 I1 u5 e6 B) `. n6 e0 K7 E a. 482.8999 b. 482.9888 c. 482.9998