求:- ]" u" b" K; C+ ~7 N& f1 u
1.AB之垂直距离为何?, U6 R: {$ j) ~( g
a.19.5606 b. 19.6506 c. 19.6605 ( Y8 Y/ k$ u4 U v2.∠ABC之角度为何?8 k) ]6 S9 t: _' G- {1 L( a
a. 51.589° b. 51.895° c. 51.985°' c" C2 I0 z2 z( i2 s
3. 红色剖面线区之面积为何? : `2 p5 e4 ^9 X7 H7 n+ W a. 108.5891 b. 108.8519 c. 108.9815% s' X6 W' n+ g) Y0 @
4. 绿色剖面线区之周长为何? 1 m& a% J! x+ T% K' f7 U: [ a. 100.4837 b. 100.8473 c. 100.7384