练习题90答案:2 T* C' {0 {9 L8 _5 {
1. a 之长度为何?6 h" b5 A# f2 p. ~
c. 76.76048 N e& u. }7 L
2. b 弧之长度为何? % L0 ]9 O F" U$ h+ C3 q" s c. 68.57236 L0 ?: H3 ~1 i6 B( v0 Z
3. 剖面线区域之面积为何? 7 n% F8 U9 n E: W! m6 h a. 443.5255
1. a 之长度为何? c. 76.7604 _0 Q, G0 _5 ?* h7 t$ Y2. b 弧之长度为何? c. 68.5723/ P. J8 t0 M7 B9 Q: K
3. 剖面线区域之面积为何? a. 443.5255 $ e& K3 i9 M8 s7 K & K. \. h; u5 t$ ?8 p6 x