Point $P$ lies on the circle with equation $( x - 2 ) ^ { 2 } + ( y - 1 ) ^ { 2 } = 16$ Point $Q$ lies on the circle with equation $( x - 4 ) ^ { 2 } + ( y + 5 ) ^ { 2 } = 16$ What is the maximum possible length of $P Q$ ?
..... 15
Point $P$ lies on the circle with equation $( x - 2 ) ^ { 2 } + ( y - 1 ) ^ { 2 } = 16$
Point $Q$ lies on the circle with equation $( x - 4 ) ^ { 2 } + ( y + 5 ) ^ { 2 } = 16$
What is the maximum possible length of $P Q$ ?