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Q: How long is a diagonal of a square with sides of length 10 cm?

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Each of them is 14.14 inches long. (rounded)

A square with a 30-inch diagonal measurement has sides of 21.21 inches in length.

Use Pythagoras. The diagonal, and two sides of the square form a right angled triangle. So if each side of the square is x cm long, the diagonal is x*sqrt(2) cm long.

162+162=diagonal2 256+256= 512 sqrt512 i.e. 16rt2

A parallelogram is anything from a square to a rectangle. As long as it has parallel sides, then it is a parallelogram. If you're thinking of a rhombus, then it has diagonal sides.

9cm

They came from geometry. If you have a square whose sides are 1 unit long then its diagonal is sqrt(2) units long.

A square has 4 equal sides. A rectangle has 2 short sides of equal length and 2 long sides of equal length

A square with a side length of 2cm has an area of 4cm2

The diagonal is 33.941 units.

The diagonal is 14.142 feet.

If the area of the square is 200, then the side is sqrt(200).The length of the diagonal is sqrt(200 + 200) = sqrt(400) = 20 meters.

The diagonal is about 16.97 inches long.

Using Pythagoras' theorem each side will be 6.363961031 units in length.

A square with a side length of 10 cm has an area of 100 cm2

A square with a side length of 3 inches has an area of 9 square inches.

A square with a side length of 15 yards has an area of 225 square yards.

A square with a side length of 2 cm has an area of 4 square cm

The diagonal of the garden is 20 meters.

The garden's diagonal is 10 meters.

You can calculate the number of square feet in a two-dimensional rectangle by multiplying the length of one of the short sides by the length of one of the long sides. 9' x 12' = 108 square feet

-- A rectangle has no 'formula'. -- The length of the diagonal is 24feet 10.62inches (rounded)

a rectangle is not a square by a square having parallel sides for all but the rectangle only has one pair of parallel sides * * * * * Actually, a rectangle has two pairs of parallel sides - the same as a square. Where they differ is that a rectangle has two pairs of sides of equal length, but each pair is different from the other. In a square, all four sides are of equal length.

A square with a side length of 23 cm has an area of 529 cm2

15 cm for the diagonal.