1. 蓝色曲线之弧长为何?( x9 A7 Z k2 f h) i5 W. k
a. 45.7543 b. 45.7453 c. 45.7354! j9 w% V I3 r, i2 P8 k3 c+ c
2. 红色曲线之弧长为何? 1 }% [: p6 F/ s: l$ P+ y a. 38.3352 b. 38.3532 c. 38.53328 `# o3 \' b' R5 d7 d7 G0 p& h2 _4 M9 ]
3. 绿色曲线之弧长为何?, e7 t% Q' W8 u u7 A
a. 30.7033 b. 30.7303 c. 30.7330 _$ v, Q5 ^+ d4. ∠DAE之角度值为何? 3 E. `- W% b/ Q a a. 106.1340° b. 106.3140° c. 106.4310° 5 x5 h/ p; r" ~
5. A B C 所围成的区域之面积为何? $ n) B7 M( M7 Q# E" a a. 424.2685 b. 424.6285 c. 424.8625