It is 4.8 with the same logic as I described before.
The sides of the triangle are 4 and 8, the hypotenuse is 4 x sqrt(5), and the radius of the circle is 6 - 2*sqrt(5)
It is interesting that one gets a finite decimal by multiplying two infinite decimals.
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Indeed the radius is 6 - 2*sqrt(5) that can be written 6 - sqrt(20) the answer of Mark.
I do not understand this comment neither your 4.8. The area of the circle is Pi*(56 - 24*sqrt(5))
Statistician: . . . glances to each side . . . steps to the window and closes the blinds . . . steps back and then whispers quietly, "What do you want it to be?"
Have a look to the "Indiana pi bill" an attempt to give an easy value for Pi. With 3.2 proposed.
I was told Pi=3 had been made by law in a Texan county. But, I can be wrong.
Do not confuse with PI ( Public Intoxication ) laws.
In college days, I remember several fellow students who proudly memorized pi to ten or fifteen or more decimal places.
For most practical purposes, "3.14" or "22/7" can be adequate, but one math professor gave a ratio that yielded 6 decimal place accuracy -- and was easy to remember.
Take the first 3 odd digits (1, 3, 5).
Begin writing in the denominator, from left to right.
Write each digit twice in order, with 3 figures in denominator, and the last 3 in the numerator.
355
----
113
For most practical purposes, "3.14" or "22/7" can be adequate, but one math professor gave a ratio that yielded 6 decimal place accuracy -- and was easy to remember.
Take the first 3 odd digits (1, 3, 5).
Begin writing in the denominator, from left to right.
Write each digit twice in order, with 3 figures in denominator, and the last 3 in the numerator.
355
----
113