【进阶级练习题56】) X% c* u8 s* U3 S" l
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求: 3 J. W2 ]- T) C; j/ D; G1. AB长度为何? # ]% L6 d1 _( A1 x; k+ a$ B T a. 107.6909 b. 107.9690 c. 107.9960; n7 n( X* J7 c h3 r5 u' r9 V2 M
2. BC长度为何?) u: S" p* h7 R2 T, y [
a. 74.6890 b. 74.8960 c. 74.9860 1 h( [' l; q, Z* ~3. ∠ABC角度为何?! b( G0 e; q k8 {; ^8 P+ u/ A- z
a. 48.0352° b. 48.3502° c. 48.5302°& k& M6 s# O3 J9 O7 o
4. 蓝色剖面线区之周长为何?7 Y6 V9 ]4 j! W% }4 q: `' f
a. 169.6099 b. 169.6909 c. 169.6990 ' q4 T) {% T# L! f5. 绿色剖面线区之面积为何?9 z0 a; E# c7 H0 N& j! u' o
a. 306.2937 b. 306.3729 c. 306.3792