to measure the wear and tear of the tire usage
Divide it across the diagonal - you don't need to measure anything.
Any rectangle that measures 12-in x 13-in has a diagonal ofsqrt(122 + 132) = 17.692 inches (rounded)
21 inches is the diagonal measure of the screen in a 21-inch TV.
You measure the screen by going diagonal across the screen. Some screens are up to one inch smaller than their advertised size.
The square of the diagonal is (652+692)=8986 The diagonal is then the square root of 8986=94.79...
6.2
Measure from one corner to the diagonal corner, and then switch and measure the other 2 diagonal corners. If the measurements are the same, then the walls are at right-angles to each other.
Diagonal = 18*sqrt(2) = 18*1.414214 = 25.45584 feet
by measuring diagonal length
A regular quadrilateral is a square. As to the measure, the answer depends on the measure of WHAT? An angle, a side, the diagonal, area, perimeter, etc.
The longest diagonal in a cube is equal to the length of the edge, multiplied by the square root of 3.
to measure the wear and tear of the tire usage
The answer depends on what characteristic you wish to measure: it volume, total surface area, largest diagonal, mass, colour, temperature, density, ...
9.2 ft
5.7 ft
4