Arectangle is 13 centimeters wide and 18 centimeters long. how long is it’s diagonal

The length of the diagonal  = 22.20 cm

Step-by-step explanation:

Here, the length of the rectangle = 18 cm

Also, the width of the rectangle = 13 cm

Let us assume the diagonal of the rectangle = k cm

As we know, EACH INTERIOR ANGLE OF THE RECTANGLE = 90°

So, if we join the opposite vertices of the rectangle, a Right angled triangle is formed.

Here, the length of the Rectangle  = Perpendicular of the right Δ

Width of the Rectangle  = Base of the right Δ

Diagonal of the Rectangle  = Hypotenuse of the right Δ

Now, by PYTHAGORAS THEOREM:

or,

or, Diagonal = 22.20 cm

Hence, the length of the diagonal  = 22.20 cm