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Since a diagonal divides a rectangle into two triangles, this is actually a problem in trigonometery. Since a rectangle has right angles, the resulting triangles also have right angles, therefore you can apply the Pythagorean Theorem. Or, just take your ruler and measure the diagonal. That's the direct approach.

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

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A 9 x 12 rectangle has a diagonal of 15.

yes if you want it to be a rectangle

The diagonal is 14.21 cm

The diagonal is 26cm

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.

Related questions

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

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.

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

Yes, the diagonal of a rectangle is X.

The diagonal is 15.652'

The diagonal is 14.21 cm

The diagonal is 26cm

There are two of them.

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.