A SQUARE

A SQUARE

The definition of a square is a rectangle that a pair of the close each others sides are congruent. For example, the description of the picture, if ABCD is a square, then = = = and all of every single angles are .
A square has two diagonals, they are and , where is diagonal = diagonal . If we cut the square at one point of the diagonal, we will be obtained two right equilateral triangles. So, we can find the side of the square if we know the length of its diagonal.
Example :
AC = 10, find the sides of square!
Answer
The side of the square are = = = = x
ADC is a right angle.
To find the side of square we use phytagoras theorem because ADC ia a right angle.
Look the picture!
Then





So, the sides of the square are 5
Exercise
Find the side of the square if =