【进阶级练习题63】: ^+ ^5 o! N, r: m& _- }6 L " y/ D0 z' _, S( L7 y
求:. f: p$ g- \) k" c g
1. AB 之长度为何?9 y. a' i/ `; b! [7 S
a. 13.0224 b. 13.0242 c. 13.0422* }" M& H6 A/ W, f2 ^
2. ∠AOC 之角度值为何?, i( ?9 N; q" r# M. }; p9 _! R
a. 29.285° b. 29.582° c. 29.825° / ~/ X3 `4 d& g& [3. ∠BOC 之角度值为何?2 u; N/ X0 W1 x- @, S# a
a. 30.384° b. 30.438° c. 30.843° 1 o' }/ ?& v2 w i4. 剖面线区域之面积为何? - T1 m( F6 P; U2 s& r. ~7 a9 ] a. 259.9099 b. 259.9909 c. 259.9990 * W1 d, W5 m* \& P) g: _5. 剖面线区域之形心其X轴座标为何? & U* l6 D6 M" y+ `) `$ O- @% N a. -33.2139 b. -33.2391 c. -33.2913 3 Y) W3 x5 k6 k7 {3 q- ~$ ?* Q! H6. 剖面线区域之形心其Y轴座标为何? 1 j3 {# F9 ?9 Y. Y3 m a. 19.1187 b. 19.1781 c. 19.1817