5 sqrt(3) = 8.66 (rounded)
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Umm... You add the sides Example if there was a triangle with sides 10mm, 50mm, 90mm you add them 10mm+50mm+90mm therefore it equals 150mm
10mm/ 4 sides into 40mm = 10mm per side.
A cylinder with a radius of 10mm and a height of 15mm has a volume of 4,712.39mm3
10mm = 1cm
if the nickels are stacked on top of each other, the stack will become 10mm higher with every nickel so 50 nickels could be 500mm high