The triangle-like figure in the diagram is formed from 6 identical closed-packed circles. If the height of the figure is 2 feet, find the radius of each circle in inches.
Draw the triangle through the centres of the circles. The side of this triangle is 4r, so the hight of the equilateral triangle is ??
The total height of the edifice is the height of the triangle you will have calculated plus twice teh radius of one of the circles.
I leave the responsibility of reconciling the mixed units to you.
CB