Sangaku https://www.mathematische-basteleien.de/sangaku.htm
Dann gilt r+r1+r2 = r+(a/c)r+(b/c)r = (1+a/c+b/c)*r = [(a+b+c)/c]*[ab/(a+b+c)]=(
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calculation [CASIO] http://keisan.casio.com History of Mathematics Archive [St Andrews] https
My Links https://www.mathematische-basteleien.de/link.htm
calculation [CASIO] http://keisan.casio.com History of Mathematics Archive [St Andrews] https