#### bob1961

##### Smoking Fanatic

- 383

- 15

- Joined May 15, 2010

http://www.1728.org/circsect.htm

I made a 1/4 scale drawing of a 30" dia tank only using a 1/4 of that circle, then drew squares that equals square inches, counted them and doubled that figure to get total square inch area it covers....I used what I have on the drawing in that calc and I came up with a different number then the calc ??....the segment area with that calc gave me 100.64 square inches, where on my drawing I came up with 126 square inches for the same numbers I put into it ??....

my drawing showing 6" height x 24" across = 126 sq in and 7" x 25" = 151 sq in....

not sure why I got two different numbers ??....if people are using the numbers from this calc there opening looks to be too small....