练习题97答案:' S1 B) _3 D c; K7 j0 C( ?; G
1. Ra 之半径值为何? . ~3 Y' d' ]' i" ?% D* A8 { b. 18.1060 ) Z& r5 W8 x) h7 a9 I7 w
2. Rc 之半径值为何? 9 i' C; {; N. c7 S b. 68.1060 Y( E1 w6 h* @: O- a; A
3. ∠ABC 之角度值为何? . D$ Y! j: z: f& h a. 14.5971° * r Z: D' _: Z. h" w J4. 剖面线区域之面积为何? ' [6 e& ^4 x5 C/ x5 l c. 3019.5947(3019.5957)。0 y) O2 Y/ S |% L' e! R