16 = 42
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17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
It is the square root of (-4-11)2+(17-17)2 which works out as 15.
It is 17*11 = 187 square feet.
11 13 17 19.
There are two: 25 and 36.