【进阶级练习题63】$ t, F4 u6 M! \6 i; H2 D B4 k + ~7 g# ^; r/ T8 U# ?
求: ; @4 D) P; Y4 G5 V7 z) d$ L' W+ E- |1. AB 之长度为何? 6 n1 {2 ?, p' X& o a. 13.0224 b. 13.0242 c. 13.0422 ) B3 C6 a8 [* y J- Y+ `$ P2. ∠AOC 之角度值为何? ! r2 R' v) l0 O, k. m( ? a. 29.285° b. 29.582° c. 29.825° ; b8 q, a/ a3 ]! J* \& `3 b y3. ∠BOC 之角度值为何?& T' |# i- l2 \8 m8 V$ Y# V6 W
a. 30.384° b. 30.438° c. 30.843°" w2 Y& R7 H _$ C5 R1 C# q
4. 剖面线区域之面积为何? 4 r1 F/ u6 M+ P; x; }, r7 L2 o+ v a. 259.9099 b. 259.9909 c. 259.99909 ?) X) g. g' o% ~* f9 w6 q7 r
5. 剖面线区域之形心其X轴座标为何? M: U. `5 S0 Q: z2 t3 y1 {( e1 F a. -33.2139 b. -33.2391 c. -33.2913$ z; _2 ?/ M; x# x( _7 o3 |2 ~
6. 剖面线区域之形心其Y轴座标为何? y5 d! {3 Q( e$ x a. 19.1187 b. 19.1781 c. 19.1817