Find the height of the triangular stack of 8-ft-diameter pipes

happiness

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Six pipes are stacked as shown. The diameter of each 8 ft. Find the height of the stack. (I drew the diagram in green ink myself. Original Diagram is in black and grey in the upper right. Ignore 970- 339 = 631.)
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The equilateral triangle sits 4ft off the ground, and its apex is 4ft from the top. So you want to find the height of the triangle and add 8 to it.
 
The equilateral triangle sits 4ft off the ground, and its apex is 4ft from the top. So you want to find the height of the triangle and add 8 to it.
How do you find the height?

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