Squaring a number means to multiply it by itself. So 3 squared, or 3^2, is equivalent to 3 x 3 which is 9. 5 squared, or 5^2, is equivalent to 5 x 5 which is 25. 9 + 25 = 34
The defenition of a rectangle is that it has 4 angles that measure 90 degrees ther are infinite legnths and inifinite numbers intinite side legnths so infinite number of unique rectangles