% c$ \7 i' C9 u# r求:: e, V% v" t( ^8 J
1. a之长度值为何? 7 I2 D* r0 j- K ~' ~ a. 173.2051 b. 173.2150 c. 173.2501 O9 T9 e. P. e& \! n$ D% a
2.AD之距离为何?+ `% n5 t0 V5 c8 g) ]+ O( r
a. 312.2499 b. 312.2949 c. 312.2994: `, z0 b1 H; {
3. ∠ABC角度值为何?4 }; z+ v8 _ E9 ?1 g' O) G+ F Z
a. 51.778° b. 51.787° c. 51.877° ( N/ c! V {' `- q# x4. 蓝色区域之面积为何? ' W9 G# \ A( u' J a. 64951.3509 b. 64951.5309 c. 64951.9053