* t5 a! H: X: e0 a1 j+ O求:- z" t+ F4 ^: C( [) Z* s
1. a 之距离为何?. L9 S" \( r+ x" j! P
a. 15.7058 b.15.7508 c. 15.7850% r4 t: J( k# t6 ?' h
2. b 之长度为何? ) X5 |4 o! c6 \# V& R# o a. 66.1049 b. 66.1490 c. 66.1904: {+ q* c/ _7 {& z( ~% i
3. c 之角度值为何? & H$ E7 X/ o0 s o6 O a. 57.6973° b. 57.7693° c. 57.9763° * l/ ]* Q, v+ j6 j4. 此图外围之面积为何? 1 ]+ g- t9 i2 k: I9 p x+ _ a. 2479.7102 b. 2479.7120 c. 2479.7210