求:# O& M. X8 ~! B" c" a9 {8 a( N% @
1. a之长度为何?0 {) `1 }, f) R0 ^
a. 17.4965 b. 17.5964 c. 17.6594/ f; E3 S N/ x
2. b之长度为何?
) M. g, d- X* a" ` a. 20.3266 b. 20.3626 c. 20.6236
0 c3 j( p9 E0 q" f! G; I$ Y7 l+ F3. c之长度为何?0 ~1 t+ ?4 Y- \8 g
a. 29.5200 b. 29.5300 c. 29.5400
9 K/ h% V6 {- {+ o1 ]' i, ?, h4. 红色曲线围成的区域之周长为何?) \; Y6 d% E* K& y* a2 ^
a. 117.3475 b. 117.4753 c. 117.5734
: D- W2 K" Y2 j5 }+ `5. 绿色剖面线区域之面积为何?
U5 B) ]; y5 n8 d* G) ja. 233.1049 b. 233.4109 c. 233.4901
3 t/ `1 l* ^) L( C/ {8 D2 N: Y3 |
+ [, B; p( q# Q% S, |* P |