A square is a quadrilateral whose four angles are all right angles and whose all sides are equal.
Let be a square with each side in length equal to and is a diagonal which divides the square into two equal triangles, and. Since, is a right triangle. Therefore
A chess board contains equal squares and the area of each square is square cm. a border round the board is cm wide. Find the length of the side of chess board.
There are equal squares each of area square cm.
Total area bounded by squares square cm
One side of the square containing small squares cm
Width of the border cm
Length of side of chess board cm.