Question

Please please please answer ASAP!

What is the length of a diagonal of a cube with a side length of 3 cm?
StartRoot 18 EndRoot cm
StartRoot 27 EndRoot cm
StartRoot 33 EndRoot cm
StartRoot 38 EndRoot cm

Answer 1

27

Explanation:

3×√3 = 5.196

√27 = 5.196

StartRoot 27 EndRoot cm

Answer 2

27

Explanation:

d^2=x^2+y^2+z^2, and since this is a cube, x=y=z=s, and we are told that s=3

d^2=3s^2 and s=3

d^2=3(3^2)

d^2=3(9)

d^2=27

d=√27

StartRoot 27 EndRoot cm