The Accuracy of the M Yard.
Thom said.” Avebury provides the final proof of the exact size of the Megalithic Yard and demonstrates the use of larger units of 2.5 and 10 M Yards.
“One of the almost perfect triangles is at Penmaenmawr, where in half yard units we get … a perfect Pythagorean Triangle.( I have left out the numbers)