>>248
If 「2 ＋ 2」means that a cross 「＋」 is surrounded with two vertical segments and two horizontal segments, 「田」as the result is composed of 'four' smaller squares and 'one' bigger square enclosing the cross.
Namely, 5 in the right side of the formula means the number of squares which can be found out in the left side of it.
