【进阶级练习题56】 & H) s Y) w8 C" x * i$ N+ z' X% P q求:* p7 Q4 P- f( o
1. AB长度为何?7 q8 D! T7 Q& X3 _' q
a. 107.6909 b. 107.9690 c. 107.99604 s- S p. X1 ?( H5 p0 ~$ @
2. BC长度为何?+ O1 W, n6 X8 c f& q
a. 74.6890 b. 74.8960 c. 74.9860 , s/ U( U) z$ T0 P3. ∠ABC角度为何? ' V% ]/ o% p e# d9 f a. 48.0352° b. 48.3502° c. 48.5302°+ v* ?" _: M% S' M C0 Y3 A( K
4. 蓝色剖面线区之周长为何?+ M/ c' [( p4 P8 ~+ H
a. 169.6099 b. 169.6909 c. 169.6990% h0 s3 R( g4 r( X' x
5. 绿色剖面线区之面积为何?/ D+ k# _9 a8 p* k
a. 306.2937 b. 306.3729 c. 306.3792