Please HELP

A diagonal of a cube measures 30 inches. The diagonal of a face measures StartRoot 600 EndRoot inches.

In inches, what is the length of an edge of the cube? Round the answer to the nearest tenth.

(image below)

Hi There the correct answer to this is The diagonal of a cube is the square root of 3x^2, where x is a side of lengthThe three dimensional diagonal is the counterpart to the two the dimensional hypotenuse found in a right triangle...mathematically a three dimension diagonal can be found with an extension of the Pythagorean Theorem adapted to the three dimensions...

d^2=x^2+y^2+z^2  but since we are dealing with a cube, x=y=z=s where s is a side lenght...

d^2=3s^2  and we are told that the diagonal is 30 in. so

3s^2=30^2

3s^2=900

s^2=300

s=√300

s=10√3 in.  exact

s≈17.3 in.  (to the nearest tenth of an inch)

Hope it helps!

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.