Poles, roods, perches, chains and acres

We have been transcribing the land measurements from the original 1617 map. So, what did one of these plots of land look like?  How big was it? How much for instance,  did Widow Lettice Marshe need to cultivate? She held 2 r (roods) 20 p (poles) + 19 a (acres) 1 r (rood) 36 p(poles) of arable land?

The only comparison we have in the village are the modern day allotments.  Therefore, we are  organising a 'Measuring Day',  just to see how much land Widow Marshe had to deal with.

We'll keep you posted.