【进阶级练习题86】 # L* ^1 g" c1 a! Z1 J) }% v P 9 r$ A& [% ]/ s4 \8 c. N/ K; h求:2 {9 ?( \( ]% @" z
1. a弧(红色)之长度为何? 3 M8 e+ o# A) M a. 205.4547 b. 205.5474 c. 205.7454% ?7 N/ n4 m0 s+ f
2. b线段之长度为何? 1 C0 g; \' W4 C/ m% i a. 18.4796 b. 18.7469 c. 18.9764% G a) M3 ~* h1 `" J
3. c线段之长度为何?% f0 }; l/ N. F5 {/ \
a. 81.4279 b. 81.7924 c. 81.9247* u2 l2 ?- I2 o% J" V8 ~1 K7 S
4. 蓝色剖面区之面积为何?6 C- |( X8 r I7 s# A
a. 482.8999 b. 482.9888 c. 482.9998