Respuesta :

snowflowerpanda

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.

If a rectangle is 12 cm long and 9 cm wide. The length of the diagonal will be 15 cm.

What is a rectangle?

It is a polygon with four sides. The total interior angle is 360 degrees.

A rectangle is 12 cm long and 9 cm wide.

Then the length of the diagonal will be

d² = 12² + 9²

d² = 144 + 81

d² = 225

 d = 15 cm

More about the rectangle link is given below.

https://brainly.com/question/10046743

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