The sites A, B, C and D in the Voronoi diagram below represent the locations of active
volcanos in an Indonesian region and points E and F are intersections.
Horizontal scale: 1 unit represent 10 km. Vertical scale: 1 unit represent 10 km.
y
10
8
6
4
2
0
A
C
2
D
4
There is a population centre at P (7,5).
E
F
6
B
8
10
X
(a) Calculate the distance from the population centre to the closest volcano.