Diagonal method

Diagonals in the quadrilateral ABCD the line segments AC and BD are called its diagonals.

If all the diagonal elements in a diagonal matrix is 0, then it is a ________ matrix.

In a polygon, no three diagonals are concurrent. If the total number of points of intersection of diagonals interior to the polygon is 70, then the number of diagonals of the polygon is

In a polygon, no three diagonals are concurrent. If the total number of points of intersection of diagonals interior to the polygon is 70, then the number of diagonals of the polygon is

A diagonal matrix is said to be ……….. If its diagonal elements are equal (other than unity)

What is the ratio of lengths of face edge, face diagonal and body diagonal of cube ?