Comments and discussion on Valentin's 4th "Then and Now" - Area

[EdS2]

(In these Comments and Discussion threads, of which this is the first, LENGTHY MATHS SESSIONS are welcome - provided of course the intent is to spread knowledge and have an enjoyable exchange of ideas. It's especially useful, I think, to adopt the convention of showing long decimal results with the correct and incorrect digits emphasised in some way: part of the interest with calculators, I think, is how much accuracy you really have, even if you always see lots of digits.)