Missing Numbers - 1

If you observe carefully, every number in the circle is the square of the total of all numbers surrounding it. Let the number that should replace $?$ be $x$ .

$100 = (1 + 2 + 3 + 4)^2 = 10^2 = 100$

$225 = (2 + 3 + 5 + 5)^2 = 15^2 = 225$

$484 = (6 + 4 + 5 + x)^2$

$\implies (15 + x)^2 = 22^2$

$\implies x = 22 - 15 = {\color{#3D99F6}7}$