Two circles of radii 18 cm and 16 cm intersect each other and the length of their common chord is 20 cm. What is the distance (in cm) between their centres?
1
\(4\sqrt{14}+2\sqrt{39}\)
2
\(4\sqrt{10}+2\sqrt{39}\)
3
\(4\sqrt{14}-2\sqrt{39}\)
4
\(4\sqrt{10}-2\sqrt{39}\)