做练习。& B, |& I4 f9 S& g! K
答案:" j- c) y5 x0 E' \; C% U* f
1. BC之距离为何? 7 o7 K' |' _ f: o6 L a. 47.02468 V, _) }5 L% O1 M# t; d; Z' \
2. <ABC角度值为何?9 a7 d4 e6 `- y% m1 w0 y
a. 93.085 °7 \% B' @6 F1 |
3. 绿色剖面线区域之周长为何? " n; N( A/ C( o) I c. 90.82335 V! `1 n& s% M% A! Z. D
4. 扣除绿色剖面区域之面积为何? Q' L r9 M5 ]# v* Q! m H0 r b. 1338.4415