



 
Hazel, If you know the lengths of the sides you can use Pythagoras theorem twice to determine the lengths of the diagonals. I let the lengths of the parallel sixes be x and y units with y > x. The two equal length sides have length z. PT is perpendicular to PT. TS = (y  x)/2 and PS = z and hence you can use Pythagoras theorem to find PT. RT = y  TS and thus you can use Pythagoras theorem again to find RP. Harley  


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