【进阶级练习题90】5 V' n$ A9 ~ o d9 r) p m
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求: . K) Z- m9 v9 I. X8 a, ]5 G) q3 U7 R1. a 之长度为何?0 ?( v' ~' |) ~8 Y) s& T( K
a. 76.7064 b. 76.7406 c. 76.7604, _9 }5 R! ~. n3 {- c c r3 I. o) \
2. b 弧之长度为何? k6 `' ]6 W W( f
a. 68.5273 b. 68.5372 c. 68.5723. P! {* S) Y5 @7 Q
3. 剖面线区域之面积为何?$ X2 N% ]) ~/ g ? y
a. 443.5255 b. 443.5525 c. 443.5552