MathDB

Estimate the smallest value of

r

such that a circle of radius

r

can contain

19

non-overlapping circles of radius

1

. Express your answer to the nearest hundredth. For example,

11.00

5.60

, and

1.34

are valid responses, but

11

and

1.342

are not. An invalid response will receive a score of zero.

2015.28