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Q: How do you calculate the diagonal of a rectangle?

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There are two of them.

A rectangle does not have a diameter, as such, but the diagonal is similar enough. If the sides of a rectangle are x cm and y cm then, using Pythagoras's theorem, the diagonal is sqrt(x2 + y2) cm.

A diagonal cannot be a side of a rectangle, and a side cannot be a diagonal.

You don't - you need additional information. Many different rectangles can have the same diagonal. If you know the diagonal and one side (which must be LESS than the diagonal), you can use Pythagoras' Theorem to calculate the other side.

You CAN'T calculate the perimeter of a rectangle, knowing only its diagonal. You do need some additional information about the rectangle - such as its width, or its length, or perhaps the length/width ratio.

The diagonal is 7.21 feet.

A 9 x 12 rectangle has a diagonal of 15.

yes if you want it to be a rectangle

The diagonal would be 12.53 meters.

Yes, the diagonal of a rectangle is X.

If the diagonal is 25m and the area is 168m2 then the longest edge of the rectangle will be 24m.

The diagonal is 14.21 cm

The diagonal is 26cm

The diagonal is 15.652'

You can calculate this using the Pythagorean formula for a right triangle.

The largest rectangle inscribed in a circle would be the inscribed square. You can calculate the area of the square by the fact that its diagonal is the diameter of the circle.

The diagonal is 20.

The diagonal is 100'

The diagonal is 47.707'

The diagonal is 48.877 feet.

The diagonal is 69.856 feet.

a squished rectangle

No. The diagonal through a rectangle can be computed via the Pythagorean theorem: c2 = a2 + b2 where c is the diagonal length and a and b are the horizontal and vertical lengths of the rectangle.

The width will be 30cm

To find the length of a diagonal in a rectangle, use the Pythagorean method. Diagonal length = square root(length squared + height squared).