【进阶级练习题90】. U5 m3 S0 Y* Z% u+ Z$ N
8 Z. j' S3 D- Q8 \! E
求:8 V3 i8 e5 C X& e1 O, z
1. a 之长度为何?" W G- k2 V5 i7 [! ?6 c. T+ ]/ ~$ Z
a. 76.7064 b. 76.7406 c. 76.76049 k; ~! C- f: y& e5 a" `, e
2. b 弧之长度为何? ! ^& P4 j- X$ A2 `, q; A a. 68.5273 b. 68.5372 c. 68.5723 + [2 G8 {) H0 U% H* r6 v3. 剖面线区域之面积为何?5 \3 F% K0 h& J
a. 443.5255 b. 443.5525 c. 443.5552
1. a 之长度为何? c. 76.76048 G/ f# ]' {# U: ^9 y
2. b 弧之长度为何? c. 68.5723- K" O/ E. V4 J0 p$ g
3. 剖面线区域之面积为何? a. 443.5255/ z! ?( ? L& y2 {7 y; c
' d( e9 c% s0 y0 }