【进阶级练习题76】 & \* Z1 U" [- \# @! c! a8 }$ V- n* [5 J# l' ?" [* r
求:0 `! M) l$ ^5 \) [9 b/ I
1. a 之长度为何?: O+ ?. W Y4 h
a. 38.1002 b. 38.1020 c. 38.1200 8 k9 X3 N+ ]% ?5 A. R2 ^2. b 之长度为何?6 u( T. A/ q9 L+ u9 a
a. 25.5296 b. 25.5629 c. 25.5962 5 o" [3 Q) L6 h4 e3. ∠ABC 之角度值为何?# H$ W- o' a+ ^* t
a. 38.006° b. 38.060° c. 38.600° 9 I5 m, i. d( Q- i+ g4. 最外围之面积为何? : Q7 {! r) h7 c y a. 469.7197 b. 469.7719 c. 469.7917
答案: 1. a 之长度为何?' W) W9 D& n9 Y* |3 K
b. 38.1020 6 H9 n4 d4 L4 z
2. b 之长度为何? 2 z8 w- G9 {+ S9 U a. 25.5296 ' H& H; x5 X4 f' k9 [ f
3. ∠ABC 之角度值为何?/ i* _' t2 d. S
b. 38.060° 0 j3 I: S. W% Y: C; t ?
4. 最外围之面积为何?' i3 o# d9 S+ c" [
c. 469.7917