【进解级练习题61】 ' `/ u- n2 ^# R& s% c6 _2 J9 ^+ \' }2 b4 F
求:' Y6 c& N4 c2 }7 S F, y5 d9 z, i
1. a 之距离为何? 5 c! A; X4 H% v3 b: N a. 15.7058 b.15.7508 c. 15.7850 / Y3 q: R4 h1 A& @$ l& {2. b 之长度为何?( k6 }8 {5 F8 D& k# C: g4 x
a. 66.1049 b. 66.1490 c. 66.19044 c4 N/ P6 S* d5 J' c: o
3. c 之角度值为何?% X& G' n0 u) v
a. 57.6973° b. 57.7693° c. 57.9763°( K) z& ?( Y( `9 k
4. 此图外围之面积为何? ; h6 W4 g& R# @2 h a. 2479.7102 b. 2479.7120 c. 2479.7210