A billboard at ground level has a support length of 26 feet that extends from the top of the billboard to the ground

H. 27 what is weird is a problem which is the same as this one 100%. So since it's a cube all the sides are equal and the perimeter is 12. I made an equation which is 4x=12. Next divide by 4 on both sides and you get that all the sides are equal to 3cm.
Volume= length*width*height
Volume= 3*3*3=27