Which number completes the pythagorean triple: 12, 18 20 22 24

The first thing that would probably come to mind when solving this problem would be to plug in the numbers into the equations. Like this  12^2 + 16^2 = x^2 (X = to the number that you plug in from the answer bank.). This is correct thinking so you can try this:

144 + 256 = 400.

So your square has to be equal to 400.

And it most common knowledge that the square root of 400 is equal to 20.

So your answer is 20.

step-by-step explanation:

consider the parallelogram shown in the attached image.

in the parallelogram hijk, the length of hk is given as,

from the properties of parallelogram we know that the opposite sides of a parallelogram are parallel to each other and are equal in measure.

therefore, the length of the side ij must be equal to the length of the side hk and that is .

hence, the expression for the length of ij confirms that hijk is a parallelogram.

is there more info provided? there is not enough information given in the problem