Question 262595
a rectangle is 13 centimeters wide and 18 centimeters long. how long is its diagonal?


The diagonal is the hypotenuse of a right triangle with sides 13 and 18. If D is the diagonal, then by the Pythagorean Theorem we know that:

13^2 + 18^2 = D^2
169 + 324 = D^2
D = SQRT(593)