(c) 

Distance/Angle	180${}^{\circ }$	160${}^{\circ }$	135${}^{\circ }$	130${}^{\circ }$	110${}^{\circ }$	90${}^{\circ }$
0.5 m
1 m
2 m
3 m
4 m
5 m
6 m
7 m
8 m
9 m
10 m
11 m
12 m
13 m
14 m
15 m