The floor of a rectangular living room is 12 meters by 9 meters. what is the distance between opposite corners of the living room? (This is pythagorean theorem btw)

15 meters

Step-by-step explanation:

that means the leg lengths of the triangle are 12 m and 9 m

use Pythagorean theorem:

D = root (12^2 + 9^2) = root (144 + 81) = root (225) = 15 m