how do I find diagonal measurement of a 20X18 square?

Answer 1

First, you call it a rectangle. Squares have equal sides. Then you use the formula:

length squared x width squared = diagonal squared

Any questions?

Answer 2

First, an object 18 x 20 is a rectangle not a square. Draw a line from one corner to the opposite corner and now there are two triangles 18 by 20 by X. X is the hypotenuse. The pythagorean therom states that the square of the hypoenuse is equal to the sum of the squares of the other sides. Therefore X^2 =18^2 + 20^2. (18^2=324) + (20^2 =400) = 724. Sq rt of 724 = 26.9

Answer 3

First and Square can be a rectangle but a rectangle can not be a square. So unfortunately you are working with a rectangle. To find the Diagonal use Pythagorean Theory

Square both sides, add them together, then find the square root of the answer.

So 20 x 20 = 400 & 18 x 18 = 324
then 400 + 324 = 724
square root of 724 is about 26.9

That should do it.

Answer 4

20 x 18 is not a square. It's rectangle. On a square, all four sides are the same length.

In either case, it's the Pythagorean theorem - Asquared+Bsquared = Csquared. So to find the diagonal, take 20x20+18x18 and then take the square root of the result. In this case, the diagonal of your rectangle is 26.90725.

Answer 5

The square of the hypoteneuse is the equal to the sums of the squares of the two adjacent sides.

X (your diagonal measurment - and the hypoteneuse in question)

X*X=(20*20)+(18*18)
X*X=400+324
X*X=724
X=26.9072

Answer 6

it's not a square. it's a rectangle. draw the rectangle. L = 18, W=20. then you can find diagonal. or you can use pythagorese theorem. csquared = a(squared) + b(squared), c= root of(18(squared)+20(squared) ), c = square root of(724) , c = 2(square root of 181), or 26.9072.

Answer 7

Pythagorean Theorem: A^2 + B^2 = C^2.

So 20^2 + 18^2 = C^2
400 + 324 = C^2

You can do the rest.

Answer 8

squareroot(20^2+18^2)=answer. this is known as pythagoreans theorom and is usually only used for right triangles, but by drawing a diagonal through the rectangle you have created two right triangles of equal size. comes out to around 26.9

Answer 9

ask your teacher
but this is the answere
you need to find the hypotenuse, wich is the part of the triangle (if you choped the square in half diaganaly) opposite the right angle.
so
20 sqaured plus 18 sqaured = the sqaure of the hypotenese, so you just take your answere, get the sqaure root of it, and thats it. congratulations. you now know geometry.

Answer 10

Measure it diagnoally. And, C^2 = A^2 + B^2, so you know the answer should be ~26.9