To find the area of the tilted square, surround it with a square (that has an area of ​ (a)   ). Then find the area of one triangle (​ (b)   ) and since there are four triangles (total area = ​ (c)   ). Then do BIG SQUARE minus TOTAL TRIANGLES = ​ area of tilted square = (d)   .

If the area of a square is 81 square feet, what would the side length be?

If the area of a square is 54, what would the side length of the square be?

Match the area of a square to its side length:

Organize these numbers as rational or irrational