Question

A rectangle is 12cm long and 9cm wide . calculate the length of the diagonal​

Answer 1

Answer: 15

Step-by-step explanation:

$d = \sqrt{l^2+w^2}$

Substitute in values:

$d = \sqrt{12^2+9^2}\\d = \sqrt{144+81}\\d = \sqrt{225}\\d=15$

Hope it helps <3

Answer 2

Answer: 15 centimeters

Step-by-step explanation: You cut the rectangle into two triangles following the diagonal. You add 12 squared (144) and 9 squared (81) together. You get 225. You get the square root of 225 which is 15 and that is your answer. Basic solving for the hypotenuse.