Posted by **helen** on Wednesday, March 14, 2012 at 3:22pm.

Find the length of d in simplest radical form of he diagonal of a cube with sides of s units.

- Geometry -
**Steve**, Wednesday, March 14, 2012 at 5:33pm
diagonal of a square is √(s^2+s^2) = s√2

diagonal of a cube is √(s^2+s^2+s^2) = s√3

Think of it as the hypotenuse of a triangle perpendicular to the base, where one leg is the base diagonal (s√2) and the height is s, making the hypotenuse

h^2 = 2s^2 + s^2 = 3s^2

- Geometry -
**joanna**, Sunday, November 25, 2012 at 5:46pm
each triangle is a 45 degrees-45 degrees-90 degrees.find the value x

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