【基础级练习题61】
2 s5 n; g8 N( ^) }" S+ Z
+ W8 E; j3 C2 Y) n9 C& d" [求:
/ m1 G0 }! S, L1. A之半径为何? & D) b2 t6 ?/ g( C: G2 Q) f* F$ A
(A) 29.5357 (B) 29.5537 (C) 29.5753
8 z% N0 c7 a7 ?5 r5 y2. B之半径为何?
& i. X+ k, p4 J- L# m& T& M, d (A) 13.7062 (B) 13.7260 (C) 13.7602
8 s$ U/ q# z8 G: H3. C之半径为何? 4 ?- ]$ C: y8 N
(A) 7.9247 (B) 7.9475 (C) 7.9742 ' r% S; w# E$ w9 W* W& p& t
4. 剖面线区域之面积为何?
3 I+ c. b/ N6 z) ` (A) 313.9476 (B) 313.9674 (C) 313.9746
1 v( q- n9 T) |- M4 n8 M8 \9 A; z& S9 i+ q. A$ X5 X9 k% x {, E; v
【基础级练习题61】标准答案:
5 f" Y3 A% C& Y- b. Q2 [1. A之半径 = 29.5753,就是(C)
7 Y7 A9 Y4 l6 ?& Z9 k, I2. B之半径 = 13.7260,就是(B) 9 {, x; Y x6 \. D, S; B: W
3. C之半径 = 7.9247,就是(A) 2 L/ r+ d& F( G: }3 P
4. 剖面线区域之面积 = 313.9746,就是(C)
3 s% t0 b" E& w( \/ a) i, z$ v* c, c4 |0 v" ^+ i# D
【基础级练习题61】解题思路:
/ _' i; C; U: G2 T; S; F本题的关键是画圆和缩放。 $ b6 s% Q0 R/ m$ V0 x6 P6 `
: P0 u( a# h# G! y# s9 p
2 y- I) R; }$ V: A4 W$ J- I0 u3 c2 l5 _+ f2 L. ^6 I
|