【进解级练习题61】$ D2 W! o+ X; E: [; J& x1 T
3 y/ Q4 H+ C; y5 x
求:: K2 G& x& B( g5 x* b' }1 H
1. a 之距离为何?3 F( d5 w" i6 ]! O
a. 15.7058 b.15.7508 c. 15.7850; q3 M3 M7 ]6 d4 {. i; k1 I( k
2. b 之长度为何?. S* y" o1 e+ U6 W
a. 66.1049 b. 66.1490 c. 66.1904 - ]% g! @* r2 d5 M2 s3. c 之角度值为何?! M p; w/ e: ]6 b, x3 R
a. 57.6973° b. 57.7693° c. 57.9763°/ `3 r% y5 n+ M7 i( [, `7 |/ p5 i
4. 此图外围之面积为何? 3 |0 x5 s6 E/ T- k' i5 F& ?: k& r a. 2479.7102 b. 2479.7120 c. 2479.7210