Z5 R9 H) G q" f0 [' X _求: 7 z0 l5 K+ o0 F8 M3 K0 H1. a 之角度值为何?8 ~# g9 B5 ^" ?5 N5 a' v
a. 72.1344° b. 72.3144° c. 72.4314°/ _9 `' o6 N# c) B! T# D9 e
2. b 之长度为何? $ C4 ?3 S' r* ^9 m0 B z) X0 o3 ~ a.32.1197 b. 32.1791 c. 32.1917" w( F& f) ? `/ o; `4 [0 t c& J( A
3. c 之长度为何? , H9 u9 U }1 _# C, g% T a. 48.2487 b. 48.4287 c. 48.8427+ n% g4 M- N; |) E/ |8 o
4. 此图粗线围成之面积为何?- c1 Y( i3 Y* p5 n) L( |
a. 1871.9921 b.1871.9291 c. 1871.2991