: Q0 `! ~" E) D/ L求:, @% g A7 e9 W5 o( E N
1. a弧(红色)之长度为何? 7 Z; t9 V% `0 e$ i6 U4 g' A* [0 I a. 205.4547 b. 205.5474 c. 205.74542 M( E0 `5 C" W
2. b线段之长度为何?2 H2 m+ Q; a4 ]5 U
a. 18.4796 b. 18.7469 c. 18.9764, V. ]* f1 D$ Z/ C7 l
3. c线段之长度为何?& P# A1 Q) y1 r8 V, y( I8 M
a. 81.4279 b. 81.7924 c. 81.9247 6 L6 O( G e7 \1 E; |8 _9 E* C4. 蓝色剖面区之面积为何? 5 {5 p/ S# L/ t/ m. U) O" D a. 482.8999 b. 482.9888 c. 482.9998