Question 256439
Here the pattern is 1,3,6,10, . . . 
The formula is
{{{Y = (x*(x+1))/2}}}
where x is the number of points
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If x = 70, then
{{{Y = (70*(70+1))/2}}} = 2485 segments
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{{{45 = (x*(x+1))/2}}}
{{{90 = x*(x+1)}}}
x = 9, x+1 = 10.
We need 9 points for 45 segments