Stupid question

heya peeps i am looking to buy some alloy wheels for my micra k10 (1989) and not sure what pcd to get as i measured 70mm bolt 2 bolt going around the wheel, but from what i have read they supposed 100 am i measuring them wrong or what cheers
 
PCD 100 is the distance diagonally between the bolts.

And a bit of pythagoras confirms this;

sqroot(70^2 + 70^2) = 98.98
 
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