wen yu draw 2 lines out from serkel senter tu the rim, yu make a pie slies
pie="sekter" in guvt krat speek
sekter hav triangel+segment, so segment=sekter -triangel.
input data: chord leng=10 & segment hite=1 (yuzeyually kalled the ark hite)
anser: radius=13, triangel hite=12, ark hite=1
angel at serkel senter=45.24 deg